Ange Postecoglou revealed he had achieved a "dream" that had been his "lifelong obsession" after overseeing Celtic's Scottish Premiership title triumph.

Celtic needed only a point on Wednesday to clinch top spot ahead of rivals and reigning champions Rangers, and they got exactly that thanks to a 1-1 draw at Dundee United.

It completes a stunning turnaround under Postecoglou, who arrived at the start of this season after Celtic had finished the last campaign 25 points off the pace.

The Bhoys recovered from early setbacks, though, and were deserving champions with a game to spare.

"It's been a hell of a season," Postecoglou told BBC Sport. "Our starting point was a fair way back, and the way this group of players and staff has risen to the challenge – I couldn't be more proud.

"It's fairly overwhelming. It's taken every ounce of me to get us where we are, and when you get to the finish line, you just want to collapse.

"We've been focused all season, not getting distracted by anything. The players were really good at dealing with what was in front of them – and that's not easy to do.

"The dream was always to manage a famous club and try to make an impact. When something is almost a lifelong obsession and you finally get there, it's hard to put into words.

"It almost feels like two seasons in one. We've jammed in a rebuilding season and a season to win. We had a lot of work to do, and with the support of everyone at the club, we got there."

Celtic's Carl Starfelt put through his own net deep into extra-time as Rangers came from behind to beat their Old Firm rivals 2-1 in a frantic Scottish Cup semi-final.

Greg Taylor fired a low finish beyond Jon McLaughlin shortly after the hour to hand Celtic the lead, before substitute Scott Arfield bent home a brilliant leveller to force additional time.

With a penalty shoot-out on the horizon, Starfelt deflected Calvin Bassey's left-wing cross past Joe Hart to send Rangers to their 53rd Scottish Cup final, where Hearts lie in wait after overcoming Hibernian on Saturday. 

A boisterous atmosphere gave way to a frantic opening at Hampden Park, with Ryan Kent firing over under pressure and Jota heading onto the roof of the net at the other end.

John Lundstram curled against the post as Rangers enjoyed the better of the first half, but their threat faded somewhat after Aaron Ramsey was injured shortly before the break.

Ange Postecoglou's side improved after half time and took the lead after 63 minutes, Taylor spinning on Callum McGregor's inventive shot free-kick before firing into the bottom-right corner.

The Hoops went close to a quickfire second five minutes later when Cameron Carter-Vickers crashed a left-footed shot against the crossbar from a corner.

They were made to pay for that missed opportunity after 78 minutes with Arfield latching onto Kemar Roofe's heavy touch to curl home just four minutes after coming on.

Celtic somehow survived Rangers twice hitting the woodwork in the 110th minute, James Tavernier smashing off the near post and Fashion Sakala diverting the rebound onto the top of the bar.

But Rangers found time for a winner as Bassey's left-wing cutback was diverted into his own net by Starfelt under pressure from Sakala, ending Celtic's treble hopes and booking Rangers' cup final spot.

What does it mean? Rangers continue bid to end cup draught

Rangers have not lifted either of Scotland's two domestic cups since winning the Scottish League Cup in 2011, and Celtic have won the Scottish Cup on six occasions since the Ibrox outfit last did so in 2009.

Their extra-time win means they will appear in May's showpiece event for the 53rd time, where they will look to lift their first domestic cup in over a decade.

Celtic's treble hopes in tatters

Meanwhile, Celtic went into this game looking to keep their hopes of a fifth domestic treble in six seasons alive, after winning the Scottish League Cup in December and establishing a six-point lead at the top of the Scottish Premiership. 

Giovanni van Bronckhorst's men will be delighted with ending the Hoops' dreams of another domestic clean sweep, and could yet win two trophies themselves as they remain in the hunt for the Europa League.

Gers end Postecoglou's derby run

Postecoglou's team looked set for a third successive Old Firm derby win when Taylor fired home the opener, but a stunning Rangers turnaround denied Celtic that feat, and means the Glasgow giants have won two derbies apiece in all competitions this season.

What's next?

Celtic continue their bid to regain the Scottish title at Ross County next Sunday, with Rangers travelling to Motherwell on the same day, looking to capitalise on any slip-up from the leaders.

Celtic manager Ange Postecoglou confirmed that a member of his coaching staff was hit by a missile during the Old Firm derby.

The Hoops came from behind to secure a 2-1 victory at Ibrox and extended their lead over their rivals Rangers at the top of the Scottish Premiership to six points with just six games remaining.

Aaron Ramsey had given Giovanni van Bronckhorst's side the lead early on, only for Tomas Rogic and Cameron Carter-Vickers to strike back for Celtic before the break.

However, the match was marred by glass bottles being thrown onto the pitch, with the game being delayed early in the second half when parts of a broken bottle were found in the Celtic penalty area.

In a separate incident, a member of Celtic's staff was also struck by an object thrown from the crowd. 

"Yeah, he was [hit by a missile], on the way in. I think he is okay. He had a couple of stitches," Postecoglou told reporters when asked if the staff member had indeed been struck by a missile.

"It is disappointing because this is a game that gets beamed around the world and it stands on its own.

"You had two teams going at it in first and second spot and you don't need a couple of idiots spoiling it."

Cameron Carter-Vickers celebrated a "massive" victory for Celtic as his goal ultimately proved the winner in Sunday's derby clash with Rangers.

Celtic took the Old Firm bragging rights back across Glasgow as they secured a 2-1 win at Ibrox.

Rangers' start could hardly have been better, with Aaron Ramsey scoring inside the opening three minutes, yet Tomas Rogic swiftly hit back for the visitors.

That was the first time since December 2002 that both teams had scored inside the opening 10 minutes of an Old Firm derby, and the first half ended in similarly frantic fashion when Carter-Vickers lashed in after a goalmouth scramble.

Celtic ultimately held on without too much trouble, despite glass bottles being thrown onto the pitch at half-time, as Ange Postecoglou's team moved six points clear of their city rivals at the top of the Scottish Premiership.

"A massive win for us, not many games left so every three points are massively important," defender Carter-Vickers told Sky Sports.

"All season we've shown that character. Sometimes it is difficult coming to a stadium like this, and it takes a bit of time to adjust.

"It was difficult to concede in the first five minutes, but after that we played well.

"My goal was probably a bit lucky. It was difficult, they were pushing men forward, and we had to defend as a unit. I thought we stood up to it well today."

Postecoglou echoed Carter-Vickers' sentiment, telling BBC Scotland: "It was an enormous effort. It was a proper derby.

"We didn't get off to the greatest of starts and the crowd was up and for us and this group of players to turn it around in that fashion, and the resilience this group have shown. 

"I'm super proud of the players. Everyone knows this isn't an easy place to come to, they're a good side and they're undefeated here this year and knowing the consequences and the significance of three points to the league today it was always going to be a battle for us.

"There were going to be times we had to roll our sleeves up. But like I said after not getting off to the greatest of starts, to go and win the game is a testament to the character of the players."

That was only a second domestic defeat Rangers have suffered under Giovanni van Bronckhorst, but both of them have been in derby games.

Ange Postecoglou told his Celtic players not to feel sorry for themselves after they were shocked by Bodo/Glimt in the Europa Conference League.

The Scottish Premiership leaders lost 3-1 at Celtic Park on Thursday in the first leg of their play-off tie against the champions of Norway.

Runar Espejord scored after just five minutes and 58 seconds to stun a packed home crowd in Glasgow, with Amahl Pellegrino making it 2-0 early in the second half from close range.

Daizen Maeda headed in a lifeline for Celtic only for Hugo Vetlesen's deflected strike to beat Joe Hart barely two minutes later and put Bodo/Glimt in control of the tie.

Yet Postecoglou, who saw his side manage only six shots on target despite nearly 63 per cent of the ball, does not believe a comeback is beyond Celtic's means.

"Obviously it's not the outcome we wanted and from our perspective, we weren't able to reach the levels we were hoping to," he said, as per the club's website.

"We controlled the game for the most part, but obviously they got their goals and they were pretty clinical in the way they counter-attacked against us, and we lacked a little bit of quality in the front third ourselves, although we did have our chances, so we paid that price.

"It was disappointing because we got ourselves back into the game, and we were controlling the game at that time – I think they probably had two chances in the second half.

"The second one's deflected and gone in, but you've got to take those hits and from our perspective, it's about making sure we dust ourselves off and go again tomorrow.

"You could sit here and feel sorry for yourself, or realise that there's still another game to go, and we can turn it around. That's the reality of it."

The return leg takes place next Thursday.

Daizen Maeda handed Celtic a Europa Conference League lifeline after his goal gave the hosts something to cling to in a dismal 3-1 first-leg defeat against Bodo/Glimt in the play-offs.

Goals from Runar Espejord, Amahl Pellegrino and Hugo Vetlesen left the Scottish Premiership leaders reeling, as Kjetil Knutsen's side seized the advantage in Glasgow.

On the back of their Europa League exit last December, Ange Postecoglou's hosts headed into the inaugural edition of UEFA's newest competition looking to deliver a positive result.

Yet they were rattled early on by the Eliteserien champions, who struck inside the first six minutes when Espejord turned Joe Hart the wrong way with a low close-range strike.

Celtic's subsequent struggle to click in the final third left them labouring for a response before the break, and an arguably lenient booking for a Pellegrino foul further frustrated their players.

The winger wasted little time after the restart to make the most of a potential escape, too, when he latched onto Espejord's flick to tuck another close-range finish into the net.

The arrival of Reo Hatate just beyond the hour mark saw Postecoglou's side find a fresh burst of life, and when Maeda cut the gap with a fine header, it looked like they had a chance to rally.

But the visitors promptly responded through Vetlesen's deflected 20-yard strike to put any comeback to bed, taking a crucial upper hand into next week's return fixture as they look to push on to the last 16.

What does it mean? Celtic at risk of successive knockout blows

Having dropped into the third tier of European football after a third-place Europa League group-stage finish, the Bhoys welcomed their visitors with the hope of a statement result in response.

Yet with nothing to show for their lacklustre efforts on a cold February night in Glasgow, they now find themselves facing the prospect of back-to-back European eliminations.

Despite their domestic dominance this term, Postecoglou's side have failed to fully convince in two competitions now – and unless they muster a major response, they face another immediate exit.

Hosts pay for wasted opportunity

With 57 clocked up this term across 26 games in the Scottish Premiership, Celtic have not typically wanted for goals.

But with just six shots on target from 15 attempts and just 1.3 expected goals, they were made to suffer for their lack of clarity in front of the net against their Norwegian rivals.

Bodo/Glimt display ruthless edge

Having now gone 10 European games without defeat, Bodo continue to prove themselves among the neutral's favourites following another fine display.

If not as flamboyantly smash-and-grab as their 6-1 blowout against Roma, their three-goal haul nevertheless thrilled their supporters – and with just four shots on target all game, they showed a clear ruthless edge to seize the advantage.

What's next?

Celtic return to domestic action in the Scottish Premiership, welcoming Dundee to Celtic Park, while Bodo/Glimt will bide their time for the reverse last-16 clash back home in Norway next week.

Rangers gave the Old Firm Derby away to Celtic, but Giovanni van Bronckhorst does not think it will be decisive in the Scottish Premiership title race. 

Celtic took the lead through Reo Hatate inside five minutes at an electric Parkhead on Wednesday and completely controlled the clash between the top two during the opening period. 

Hatate rifled in a brilliant second and two minutes later crossed for Liel Abada to make it 3-0 on the stroke of half-time. 

Rangers improved after the restart but were unable to stop their 21-game unbeaten run coming to an end, with Celtic replacing them at the Premiership summit and going a point clear. 

"It seemed like it was the first Old Firm game we'd played. We know what the Old Firm will bring, what we have to do … but it seemed like we weren't ready for it," Van Bronckhorst told Sky Sports. 

"You see the way we gave the goals away. It's the sharpness, I cannot say otherwise. It's not going with your man, not being ready for the battles. I think it was unbelievable the first half I saw. 

"I think our Old Firm game started in the second half. We were much better, much more aggressive and we played the second half really well. But in the first half we gave the game away. 

"It wasn't something I expected. When I see the trainings we had, the focus we had before the game, but when the whistle blew, we were just waiting for the goal to be scored. We were too naive and we deserved to be down 3-0 with the way we played. 

"We had an honest conversation in the locker room after the game.  

"We're not the first Rangers team to lose. I lost very big here as a player, but we eventually became champions that year. Of course, we wanted to win this game, but these games don't decide the championship. We still have many games to play and we have to be ready." 

The victory was Ange Postecoglou's first since taking charge of Celtic and ended a six-game winless run against Rangers in the league. 

The Australian was thoroughly impressed with how his team outplayed Rangers and believes there is still plenty more to come from the Bhoys. 

"Our first 45 minutes were outstanding; three great goals," Postecoglou told the BBC. 

"Our football was pretty special and their keeper pulled off some great saves. In the second half, we had to defend a bit more but we've been a team that can do that. It shows another layer. We knew the consequences, what it meant to our supporters, and we stood up. 

"Considering the context of the game and the opposition, I thought our football was outstanding. It's the kind of football team we want to be. It doesn't mean you disrespect or dismiss the opposition. We are still developing, but we want to take it to the opposition, and if we do that, we can take it to any opposition. 

"We've still got key players missing, very influential players. Some are just in the door. Reo Hatate and Matt O'Riley have played fewer than five games. Our target was not top spot, our target is to win things, and if we're going to win things, we have to keep improving." 

If Kyogo Furuhashi is any indication, Celtic should be looking to Japan for more players, right?

Former Yokohama F.Marinos boss Ange Postecoglou used his J1 League insight to lure the previously unheralded Kyogo to Parkhead and what a signing it has proven to be – the Japan international has taken Glasgow by storm with 14 goals in all competitions.

Now, Celtic manager Postecoglou is reportedly preparing another raid on Japan's top flight, including his former club, to help bolster his title-chasing side in the January transfer window.

F.Marinos star and joint Golden Boot winner Daizen Maeda, Kawasaki Frontale utility Reo Hatate and Gamba Osaka's Yosuke Ideguchi are believed to be all closing in on moves to Celtic as the Bhoys' Japanese contingent grows.

With speculation mounting, Stats Perform looks at the numbers behind the trio, using Opta data.

Daizen Maeda, Yokohama F.Marinos

Postecoglou leaned on his experiences as a rival coach to prise Kyogo from Andres Iniesta's Vissel Kobe at the start of the season, but it is a completely different matter regarding Maeda, who was signed by the Australian coach, initially on loan in 2020.

Following a difficult loan spell in Portugal via Maritimo, Postecoglou turned to Maeda after leading F.Marinos to their drought-ending J1 League title the season prior. The 24-year-old has not looked back, taking his game to a new level with the runners-up in 2021.

The two-time Japan international shared the Golden Boot with Frontale talisman Leandro Damiao after the pair both scored 23 goals, while he was named in the league's Best XI.

With pace to burn and the ability to play on the flank or through the middle, Maeda fits Postecoglou's high-octane brand of football and pressing philosophy to a tee – he tallied the most sprints across the league (1,457), well ahead of Consadole Sapporo's Tsuyoshi Ogashiwa (869).

Maeda, who likes to cut inside from the left, also led J1 League in shots on target (51), shooting accuracy (63 per cent), big chance total (33), big chance scored (18), expected goals (21.3) and touches in the opposition box (190). He was second for total shots (92) and shot conversion rate (23.9).

"I never imagined I would end the season as top scorer in the league. I feel I have been able to prove I was a good signing here," Maeda, who could provide another dynamic to Celtic's attack having scored a joint-league-high six headed goals, said at the end of the season. "As always it was great to score, but I would have liked to have ended the season with a win.

"I've had a great season although I am disappointed we never managed to win the title, but on a personal level, I am very proud I was able to finish as top scorer. I always want more goals. You can never score enough.

"I believe this team can go on and have a great season next year too. Whatever happens, Marinos are a great club. I've never hidden my ambition to play in Europe. When I tried before in Portugal, Covid ruined it for me. This season has changed everything for me. Goals and a call-up for my country. For me, it's just the start."

Reo Hatate, Kawasaki Frontale

If Celtic want a man that can cover a number of positions, Hatate is their guy.

A defender, midfielder or forward, Hatate is coming off his second successive top-flight crown with the league's dominant force Frontale, who have won the title in four of the last five years.

Hatate has played a key role in helping maintain Frontale's dominance since making his debut in 2018.

The versatile 24-year-old – who has not played abroad, unlike Maeda or Ideguchi – is fresh off a stellar season that saw him named in J1 League's Best XI.

Like 2020, Hatate scored five goals in 30 appearances, while he supplied two assists in the league as he often played in the middle of the pitch, though he can also be deployed at left-back.

Comfortable on the ball and secure in possession, Hatate boasted a passing accuracy of 82.1 per cent in 2021. As for his creativity, he created 33 chances, highlighting his vision. He ranked in the top five for shots on target (third, 22), total shots (fourth, 59) and passes in opposition half (five, 1,297) among all defenders and midfielders.

Covering plenty of ground, Hatate also demonstrated his defensively capabilities throughout the campaign with 45 interceptions and 159 duels won, with a 53.4 success rate.

Yosuke Ideguchi, Gamba Osaka

Of the three players targeted by Celtic, the 25-year-old is somewhat the most surprising.

Labelled "wonderful" previously by former Manchester United playmaker Shinji Kagawa, Ideguchi endured a forgettable time in Europe – he joined then-Championship outfit Leeds United on a four-and-a-half-year contract in 2018 but never made an appearance for the club.

Ideguchi then bounced around on loan at Cultural Leonesa in Spain and Greuther Furth in Germany before returning to boyhood club Gamba Osaka, where he has excelled across two spells.

A player with a lot of potential upside, Ideguchi is more of a holding midfielder and is capable of finding the back of the net.

Ideguchi – part of the Gamba team that tasted domestic success via the J1 League (2014), Emperor's Cup (2014 and 2015), J.League Cup (2014) and Japanese Super Cup (2015) prior to his Leeds departure – is coming off a 29-game season, his most since the 2017 campaign.

While he did not score or register an assist, unlike the season prior when he scored four times and teed up three goals, Ideguchi's work rate and tenacity was invaluable for Gamba.

In 2021, the 15-time Japan international won 55.5 per cent of his tackles with 36 interceptions and 78 duels won. Since 2019, Ideguchi is a top-10 midfielder in tackles (fifth, 145), tackles won (fifth, 85) and interceptions (10th, 109).

Ange Postecoglou is in the midst of the biggest job an Australian coach has held in men's club football.

Postecoglou changed the landscape of the game in Australia and left a legacy in Japan, where he conquered the J1 League with Yokohama F.Marinos before he was lured to Glasgow by a wounded Scottish powerhouse Celtic, dethroned by bitter rivals Rangers.

After some initial backlash, Postecoglou has Celtic fans dreaming of glory through an emphasis on a high-octane style of attacking football and unrelenting belief in his philosophy.

But to get a clear picture of Postecoglou – the most decorated coach in Australian football – and his journey to Parkhead, you have to go back to his days at boyhood club South Melbourne.

Most know about Postecoglou's love for South Melbourne, where his passion for the sport grew alongside his father after immigrating from Greece.

Postecoglou went from juniors to seniors, winning two titles as a player before delivering back-to-back NSL titles as a coach and an unprecedented spot alongside Manchester United at the 2000 Club World Cup in Brazil.

Michael Petersen saw the making of Postecoglou unfold before his eyes. The former South Melbourne and Australia midfielder had been involved with the Australian great since around the age of 10 – the pair initially clashing in a junior rivalry between South and Port Melbourne.

Petersen eventually joined Postecoglou at South Melbourne in the late 1980s.

"He was a natural leader," Petersen told Stats Perform. "In a lot of ways, probably needed to get up to speed personally, but it was an invisible leadership. But he was always serious about his football. He loved the club. So his loyalty was unquestioned."

A trail-blazing coach, Postecoglou's career in the dugout is well-documented but he was also successful on the pitch – the former defender is considered to be one of South Melbourne's greatest players, having won eight pieces of silverware, while earning four international caps for Australia.

However, Postecoglou's career was cut short due to a knee injury.

"He was underestimated [as a player] but obviously he got wiped out pretty young at 27," Petersen said. "I think you're just coming into your professional career [at that age]. At the time, South Melbourne had a lot of good players in all the lines so he probably went a little bit unnoticed but not in our changing room. He was very well respected. You obviously don't make someone captain if you're not first on the teamsheet, so he was always first picked on the teamsheet."

Postecoglou's success has been shaped by his father, Dimitris, and legendary Hungarian Ferenc Puskas.

The 56-year-old played under Puskas from 1989 to 1992, forming a close bond, before launching his own coaching career at South Melbourne.

Postecoglou was appointed in 1996 and former general manager Peter Filopoulos was instrumental in the ex-captain's rise from skipper to coach.

"Every time I spoke to Ange, I felt like I was educated about football. Because I was an administrator. I never played at the high level. I was a little bit more educated about South Melbourne's history and he was very proud of South Melbourne history, the club and he always had these really big aspirations for the club, but also big aspirations for football in Australia as he still does," Filopoulos said.

Postecoglou's transition from player to senior coach at South Melbourne almost did not happen following the sacking of former Socceroos boss Frank Arok.

After a 3-0 loss away to Marconi in March 1996, Arok was relieved of his duties and Postecoglou put in charge on an interim basis for the remaining three games of the season.

"I remember getting the long bus trip to the airport from Fairfield and Frank had slumped in his chair and was just sulking a little bit. The players started to misbehave and were bantering. It was as if they had won 3-0, not lost 3-0. I could see Ange to the right of me was just not amused at all right, I'm sitting at the front of the bus as the official. And it got to the stage that it was out of control on the bus," Filopoulos recalled. "He went up to the front of the bus and picked up the microphone. He said, 'You listen to me, you blokes'. It was silent and he said to them, 'I've played for this club from under eights, right through to every level of South Melbourne, I've worn this jersey for every team age group, to the seniors, I captained this club and won championships. If you want to muck around, no problem, we lost 3-0 but I just want to tell you my perspective, today was the worst performance I've seen of any, any South Melbourne team of any age group in my entire career. So if you guys are happy with yourselves, and you want muck around on the bus, why don't you just reflect on the disgraceful performance and how you disgraced the team jersey today and the club'.

"That was it. There was silence for the rest of the bus trip. And then we got to the airport. And there was all these shuffling of the boarding passes. No one wanted to sit next to Ange. Hindsight is a beautiful thing, right? But I remember thinking to myself back then this guy has something special."

However, Postecoglou – who was working in a bank at the time to supplement his salary of being an assistant coach – was not even in the equation to make the step up permanently after winning all three games as South Melbourne's hierarchy eyed bigger and more established names.

"I'd be in the board meetings as a general manager, and they'd be speaking about Zoran Matic and [former Australia coach] Raul Blanco, all those big names of the time. Ange came into the office and he wasn't really mentioned around the table. They all thought he'd automatically be an assistant," Filopoulos said.

"He goes to me what's going on with the coaching gig? And me naively, I said we had a meeting last night and we're talking about Matic and Blanco. And Ange goes, 'What about me big fella?' I said, 'Are you interested?' He said 'Yes I am, I am interested'. I said, 'Well Ange, if you're interested, you need to make it known'. I thought, I wonder what the young fellas thought. We had the younger committee members and older ones. I remember ringing up some committee members and I threw Ange's name in the mix and over a few conversations, you have to give him a chance to present.

"So what I did back then, we were a very close-knit social group, the younger guys and I set up a barbecue at my place. The coaching conversation came up. And everyone's talking about those big names again. And then Ange said, 'You know I'm interested right?' And someone said, 'What? Are you really interested?' Ange started talking about his philosophy and ideas. It went for like 30 minutes. It was like a full-on pitch without knowing it was a pitch. He finished and it was dead silence. The vice-president at the time said 'Ange you're our f****** coach mate'. That was it. We lobbied hard and got him through. It was tough to get it through. There were some really older guys who weren't convinced.

"Ange got the job. And a lot of people would say that was a foresight. I would say, sometimes it was instinctive that it was the right decision. He changed everything. So there's me as general manager, it was actually quite good, because there was all these expectations and all these different things he wanted in place, which meant I worked pretty hard for him to deliver it."

But it was not all smooth sailing after fighting tooth and nail to appoint Postecoglou – a run of just one win from seven games to open the 1996-97 season had some South Melbourne committee members calling for Ange's head.

Filopoulos said: "There were a few phone calls from committee members and I remember one guy, he said 'you need to get rid of him at midnight tonight so no one sees him leave the club because you've made a mistake, and because you orchestrated all of this, you can follow him behind'.

"It came down to the eighth game at Marconi for a coach's career, really, because the pressure was on. We won after a scrappy 87th-minute goal. Had we not won that game, it would have been a different future for Ange. The rest is history. After that, he improved our football club. He took it to another level. We became a true destination club."

"So a similar story to Celtic, it takes some time, right? Because he does, on my experience, he turned our program upside down. He has meticulous detail and thought process, even to the point of dressing room access," he added.

Petersen, who also served as Postecoglou's assistant during his tenure as head coach of the Young Socceroos, experienced the "seamless" transition from player to coach up close and personal.

"There's layers to having a good football IQ. There's layers to it," said Petersen, who was told his playing career was ending by Postecoglou. "Ange has always had it. No, not even an issue. Very, very astute. I can rubber stamp that from, from way, way back. And that's to a point is if you love something, you really go deep into it. He goes deep into, you know, picking a football team for any matchday is a bit of a puzzle. You've just got to put the whole thing together, you've got to get the right balance of energy, skill sets. Who's going to actually perform on the day for that given day?

"He doesn't get it wrong a lot. And I can say that, but I think his history shows it. He's managed to get it right on the big days. It's by design, it's not coincidence. He gets it right. You can read all the books in the world. And you either got that gift, or you don't have that gift."

"At the time [after coaching South Melbourne to NSL glory] I thought Ange was Australia’s modern-day version of Alex Ferguson," he continued. "To this day I haven't changed my mind as I have watched him evolve and succeed and continually challenge himself and the type of football his team produces. Ange wins and wins well with style and grace."

From South Melbourne to Australia and Japan, Postecoglou has won it all – a pair of National Soccer League championships, back-to-back A-League titles, a record 36-match unbeaten streak at Brisbane Roar, plus a ground-breaking 2015 Asian Cup triumph with the Socceroos and a J1 League crown with F.Marinos – while silencing his doubters.

Postecoglou, like Manchester City's Pep Guardiola and former Juventus and Chelsea boss Maurizio Sarri, pushes the boundaries. Firmly set in his belief of how football should be played, Postecoglou's approach never wavers and success follows in his pursuit of excellence.

That has always been the case for Postecoglou.

Recalling Postecoglou's first steps in senior coaching and his pitch-side antics, Petersen – who also worked alongside Ange at South Melbourne after retirement – said: "We almost had a rule, no one was allowed to talk on the bench. If you're gonna say something, it's gotta mean something, otherwise chitter chatter and joking around, none of that. So there's none of this micro-coaching, if you like. Ange was almost locked in tune with the game. He was actually very, very still, quiet and measured."

Postecoglou is known for not getting too close to his players and Petersen added: "I think that's a maturity beyond his years in a sense that he always, because he probably had to start coaching young and he kind of realised early that you do have to draw a line from mateship because players are insecure creatures, and they'll look for any way to get a way in and if you can be pals, you might jag a spot because he likes you.

"Ange never did that. He made decisions that were based on what was best for the club, not necessarily on the individual. Even as a captain, looking back, he was galvanising the hierarchy, the directors of the football club, everything was all about what was best for the football club. I think that's rare to see players who do that. And then already when they transition into assistant coach and then senior coach, you knew there was a line. And that was all right. I think, in the wash-up, once you know the rules of a gaffer, you love it, you go, 'Okay, well, I know where I stand, I've got to perform'. And it's not just performing in games, it's performing at training. We have to perform, every training session means something.

"We joke around in the changing rooms and then we had fun. We had ghetto blasters, telling jokes. I think the moment we hit the football pitch, for that block of time, for an hour and a half, it was business. There's no laughing, football is serious. Because you laugh and joke, you lose football games. So you train how you play. So the intensity should always be at training. I think Ange knew that already at a young age – perform at training, transition that into games, and then whatever happens after hours, yeah, let's have some fun as well."

When it comes to reputations, once you have one, they are hard to shake.

Kevin Muscat knows that better than most, having earned a reputation as a hardman throughout his playing career in Australia and the UK, where he was the ultimate villain, but despite his combative approach, there was more to his game.

Muscat, who retired from professional football in 2011, was always comfortable with the ball at his feet, preferring to play out from the back. His teams mirror that view, as he now finds himself following in the footsteps of Aussie trailblazer Ange Postecoglou once again in Japan.

The captain of Melbourne Victory in their first A-League Men season in 2005, Muscat replaced Postecoglou as head coach at AAMI Park in 2013 after the now Celtic manager took charge of the Australian national team, having served as his assistant.

Muscat delivered two A-League championships and the FFA Cup, playing an attacking brand of football, before opting to call time on his 14-year association with Victory in 2019.

"Subconsciously, I was doing a form of coaching when I was playing. Albeit, it wasn't organising tactics or deciding the style of play, but I was driving that on the park. That's just who I was," Muscat told Stats Perform as he discussed his transition from captain to coach.

"For example, the first year at Victory, we get to the end of the season, we had [goalkeeper Eugene] Galekovic and [Michael] Theo – they used to play two games each. They weren't too happy with that. I said to them 'when we get a goal-kick, why wouldn't you drop it to me or give me the ball?', 'Oh we were told not to give you the ball because you'd play out from the back and we were to kick it forward'. Then it started, well okay, that's why I like to do.

"A lot of people spend a lot of time creating a perception of themselves instead of being themselves and let a perception be created by being themselves. I've done the latter and just been myself. I actually enjoyed passing the ball and thought I was a very good passer of the ball. I wanted to keep possession of the ball. That's how it started to form, building up my own ideas and style.

"Having an opportunity to work with Ange and try to fit in so much during the 14-15 months together. Fitting in so much knowledge. That's when it dawned on me – I knew I wanted to be a coach but then I was like, wow, this is what it takes.

"Ange took me out of comfort zone. It's not really a test because Ange is focused on winning the game and everything needs to be right, but I found myself tested and out of my comfort zone. I had spoken to Victory two or three times prior to that about when opportunities were available to take over and I didn't even entertain it.

"When Ange went to the national team, I had a conversation with him and that gave me a lot of belief in my own thoughts and coupled with how Ange goes about his style of play. I knew I was ready then. Fortunately enough, Ange was fairly influential in speaking to the club. The rest is history.

"Perception is sometimes not the reality. I'd like to think the five seasons I was coaching Victory, we played some really good football, some exciting football."

The 48-year-old won 87 A-League matches – the fourth most of any coach in the history of the men's competition, after Ernie Merrick, Graham Arnold and Tony Popovic, with the ex-Socceroos skipper one of seven coaches in the history of the league with a win percentage of 50 per cent or greater (51).

Muscat departed Victory with his teams averaging 1.7 goals per game; among managers who have coached at least 30 matches, only current Australia boss Arnold (1.8) has seen more goals scored per game.

Once Postecoglou was lured to Glasgow by Scottish powerhouses Celtic at the start of 2021-22 after guiding F.Marinos to their first J1 League title in 15 years in 2019, the Japanese club turned to Muscat. Just like he did at Victory, albeit in different circumstances, the latter stepped into fill the void left by compatriot Postecoglou in July.

"Whatever we do, it comes down to perception and narrative," Muscat, whose playing career featured stints at Crystal Palace, Wolves and Celtic's bitter rivals Rangers, while captaining Millwall to the 2004 FA Cup final against Manchester United, said as he recalled his move to F.Marinos. "More times than not, the people holding the pen or keyboard, dictate the narrative.

"There was so much stuff that I presented from my time at Victory and the way we played because we did for many years played an attractive brand of football, in my opinion. We scored many, many goals and entertaining goals. But maybe that's not the perception in Australia because it depends on the narrative.

"I'm not one to push the narrative and agenda but ultimately the perception is, in a percentage wise, what is mostly believed. But when it came to the crunch and I had to present, I was fortunate enough to fall back on some stuff in relation to that, where perception was eliminated and it was fact and visual."

F.Marinos were crowned Japanese champions two years ago, playing a high-octane and entertaining style of football under Postecoglou, who completely transformed the club that are part of the City Football Group (CFG). His legacy lives on in Yokohama.

Muscat, though, is building on Postecoglou's work, with F.Marinos second in the table this season, behind runaway leaders Kawasaki Frontale through 33 rounds.

"It was clear and evident from those discussions and hence the way it influenced my presentation, they truly believe here at F.Marinos to continue the legacy of Ange and the legacy of the football club, which the club and fans truly believe in – the way they think the game should be played," Musctat said.

"Everyone wants to win but there's high level of belief in the process and style of football. From my perspective, that's what appealed to me.

"I was under no illusion because there'd be people, and rightly so, who'd say he took over a club that was well versed in terms of playing style and where it's at. On the flip side, it had some real challenges because normally you get a job, most times, because something isn't going well and someone has been dismissed.

"This was very unique and presented its own set of circumstances because you're actually stepping into the shoes of a great manager and someone who has done so much previously and for F.Marinos.

"Throw into the fact there was quarantine and I came out a day before seven games in August. It's been everything I expected, it's been thrilling. To be able to continue on in F.Marinos fashion and style of football but also try to improve the team. We had an unbelievable little run where we started to apply some pressure and Kawasaki have pulled away again in recent weeks. We'll keep fighting with our last breaths."

As Muscat said, it is not so straightforward taking on a role where not too much was going wrong – Postecoglou was handpicked to oversee a rebuild at Celtic, who were dethroned by Steven Gerrard's Rangers last term.

But Muscat is trying to put his own stamp on F.Marinos, who have won eight of his first 13 matches in charge with an expected goals (xG) value of 2.01 and 26.14 in total, having scored 31 times in that period.

Maintaining a high-pressing philosophy under Muscat, F.Marinos – spearheaded by forward stars Leo Ceara and reported Celtic target Daizen Maeda – have won possession in the final third on average 5.77 times per game since his arrival.

When comparing F.Marinos to the league leaders or second team over the entire 2021 campaign so far, they rank first in xG (64.81), total shots (505), shots on target (188), passing accuracy (85.8 per cent), possession (65 per cent), passes in opposition half (12,145), open crosses (581), big chance total (91) and total fast breaks (12).

"There were some challenges stepping in and following Ange because the perception is everything is set up ready to go and the reality is, it was and I'm comfortable admitting that," Muscat said. "Then it was finding a way to continue that on and improve.

"What we looked at was where we were getting a lot of passes. We were very comfortable building up and drawing teams onto us then utilising the space. Whether it was in front of a back four, five or six or behind them, if they were really aggressive in their endeavours, trying to force us to play long and we'd persist and play through that, knowing there's space the other side.

"As time started to go on, we were scoring freely, you could sense teams weren't as aggressive pressing us. We worked hard on trying to increase the amount of time in our opponents half, the amount of passes in our opponents half.

"What it did do, teams are actually sitting so deep, the consequence is not a lot of space and opportunity to get behind them. Now we're in a position where, if we do get an opportunity go get forward and use space behind, where we can do that early, we still have to take that chance. But, now it's a matter of breaking teams down when they're a lot deeper.

"We had a lot of joy with the front players and they were scoring freely. Opponents have adapted. Now we have to shift and adapt. Another thing to factor in is the time of the year – teams above the relegation zone fighting for their lives, there's a lot of self-defence, teams are going into that mode.

"That's the side of the game that interests me a lot – finding and trying to identify trends prior to them happening. Then identifying trends while they're happening and try to find solutions."

Like Postecoglou, Muscat is getting his message cross through a translator.

"There's one thing that is constant in football: you're dealing with people. Fortunately, I find myself working with a translator, Yuchi; he is a wonderful guy," the 46-time Australia international said. "He actually cares, he is invested, he wants the team to play well. He is in all the meetings, he is riding the wave just as much as me and possibly even more emotional than me.

"From that side, you miss that element of directness and the emotion of having a connection with somebody. The next best thing is to have someone like Yuchi. We do a lot of video. We all learn in different ways.

"I think the one thing this pandemic has taught us – before this I didn't have an idea what Zoom or Teams was. If you want to survive, you'll find a way like we have these past couple of years."

Muscat's journey to Japan came after a short spell in Belgium with top-flight outfit Sint-Truiden.

Trying to break down barriers like Postecoglou amid a stigma against Australian coaches in Europe, Muscat's AFC Pro license was not recognised initially, leading to him being named technical director. All in all, his tenure did not go according to plan following a promising start.

Despite the setback, Muscat remained steadfast in his desire to succeed outside of Australia amid interest from his homeland and beyond as he continues to build his growing coaching reputation.

"We arrived in the summer and ultimately I was the coach at the time but because of the AFC Pro License – I lasted more than the 14 games reported," he said.

"We made some progress. The reason I was there because the club and owners had a vision to change the way they were playing. We went in during the winter break, we were in Spain. All of a sudden it was flipped 180 degrees to what they were doing prior. We had immediate success in terms of results. Then you could see the rewards paying off in terms of performance.

"That season finished and the pandemic hit. We didn't recruit anywhere near, that window was the first window we had to affect the playing squad in terms of personnel. To maintain where we were and progress, we needed to bring in players.

"It was very challenging for most clubs. We struggled in the market. We lost our captain and influential attacking midfielder and another striker. The list went on. I hear this question, 'well if you haven't got the players, why do you persist in playing a certain way?' The answer is quite simple because that's what I believe in and enjoy. If we don't have the players, well we're going to make this group better.

"We started season okay. Then you could sense one or two people around you at board level and even at the club, not having the same belief as you. The reality is, the three or four games leading up to my last game, we were playing some great stuff as crazy as it sounds. I could see us making progress. I could sense that we were going to get it right, the players were strong in their beliefs and resilient in persisting.

"Unfortunately, when your first instinct is to analyse results, you're missing the path that we agreed that's why I was coming there for.

"It was an unbelievable experience for me. I could've sat comfortably in Melbourne, walked out to my coffee shop in Albert Park, read the paper every day, but I wanted to take myself out of my comfort zone and learn, go on a journey and learn. So far, when I've made those decisions, they've been rewarding."

Muscat added: "I was determined that I wasn't finished. There were three-four opportunities – some in Australia and some in Europe. This opportunity come up to interview. The persistence and the will and want, now I find myself here. I couldn't be happier."

Celtic battled to a 4-2 victory over Jablonec in the first leg of their Europa League third qualifying round tie despite leaving star forward Odsonne Edouard on the bench.

The win represented Ange Postecoglou's first competitive success since his appointment in June, with strikes from Liel Abada, Kyogo Furuhashi, James Forrest and Ryan Christie putting the Hoops in firm control of the two-legged encounter.

Having suffered another Champions League mishap against Midtjylland, Celtic asserted their authority early as Abada converted on the follow-up from his initial effort to open the scoring.

Furuhashi, on his first Celtic start, doubled the visitors' lead with a delicate dink just four minutes later, but Vaclav Pilar instantly responded to halve the deficit, smashing a half-volley past debutant Joe Hart.

After the hour mark, Abada twisted and turned on the edge of the area before Jan Hanus denied him, only for Forrest to sneak in on the rebound to restore the Hoops' two-goal advantage.

Tomas Malinsky curled in a second for the hosts, but Christie added an important fourth for Celtic when he directed a diving header past Hanus in the 88th minute.

Christie's late effort means Postecoglou's men, who will no longer benefit from the away goals rule in Europe, take a two-goal lead back to Celtic Park next Thursday after hosting Dundee in the Scottish Premiership on Sunday.

It is a new era under Ange Postecoglou at Parkhead.

Tasked with leading an embattled Celtic back to the Scottish summit, having been dethroned by bitter rivals Rangers last season, Postecoglou is slowly putting his stamp on the club.

Prised from Yokohama F.Marinos after ending the club's 15-year J1 League title drought in 2019, Postecoglou has returned to Japan to raid Andres Iniesta's Vissel Kobe for Kyogo Furuhashi.

Postecoglou knows Furuhashi well from their time together in Japan, where the 26-year-old forward has starred since arriving from second-tier outfit FC Gifu in 2018.

Regarded as one of the country's most exciting talents, the Japan international brings plenty of goals, pace, creativity and dribbling ability to Glasgow, with Celtic fans hoping he can follow in the footsteps of country great Shunsuke Nakamura - who won six trophies during his time in Scotland.

Stats Perform looks at the numbers behind Furuhashi, using Opta data.

Endorsed by Barca great

If there is one player who knows a thing or two about succeeding in Europe, it is former Barcelona captain Iniesta.

Iniesta - the most decorated Spanish footballer of all time thanks to 35 trophies at Camp Nou - was lured to Japanese club Vissel in 2018, the same year as team-mate Furuhashi.

Furuhashi tops the league's scoring charts this season with 15 in 21 appearances for third-placed Vissel, three more than ex-Brazil international Leandro Damiao (Kawasaki Frontale), Anderson Lopes (Consadole Sapporo) and Ado Onaiwu (F.Marinos).

He scored in his farewell appearance for Vissel on Saturday, the opening goal in the 1-1 draw with Cerezo Osaka.

Only Kawasaki's Yu Kobayashi (44) has scored more goals in J1 League than Furuhashi since his first appearance in the competition (August 5, 2018).

"To be honest, Kyogo absolutely has the talent to play in Europe," Iniesta said previously. "He's leading the J1's scoring chart, but it's not just that. He's got strong technique, and I believe he can succeed in Europe."

Since his J1 League debut three years ago, Furuhashi has been involved in 58 goals (42 goals and 16 assists), the most number in this period.

"I'm sure he's got scouts watching him already, but it's going to be tough for us because he scores a lot of goals," Iniesta added.

"It'll be tough but if he goes to Europe, I'll be incredibly happy for him, because for Japanese players it's a dream to play in Europe."

Ange turns to familiar face as Celtic rebuild

Furuhashi evidently left his mark on Postecoglou in Japan.

Coming up against Postecoglou's F.Marinos, Furuhashi scored three goals across all competitions.

On paper, Furuhashi seems to be the perfect fit for Postecoglou's high-octane, attacking style of football, having been involved in 106 shots (82 shots himself and 24 chances created) - the highest figure in J1 League this season.

Before his farewell appearance on Saturday, Furuhashi had the highest non-penalty expected goals (10.9), best non-penalty xG per shot (0.14), most shots following a carry (30) and most shot involvements following a carry (37) in the competition in 2021.

"We are delighted to bring Kyogo Furuhashi to Celtic. He is a player of real quality and clearly someone I know well," Postecoglou said after a four-year deal was agreed following the arrivals of Liam Shaw, Joey Dawson, Osaze Urhoghide, Liel Abada and Bosun Lawal.

Furuhashi - who has managed three goals in six appearances for Japan, with only two starts - will now test himself in Europe.

He has won the most points thanks to his goals and assists in the league this season (16 points).

Points won thanks to a player's goal is based on how many points a team would have accrued had a certain player not scored in that game at all. For example, a hat-trick in a 6-1 win gains no points, whereas one in a 1-1 draw gets one, two in a 2-1 win gets three, two in a 2-0 win gets two and so on.

"I think he will add something special to our squad and I am sure the way he plays will excite our supporters," Postecoglou said. "We look forward to welcoming him to Celtic."

Ange Postecoglou changed the landscape of Australian football and now the trailblazer is tasked with leading an embattled Celtic back to the Scottish summit, having been dethroned by bitter rivals Rangers.

Postecoglou – cut from the same cloth as Pep Guardiola and Maurizio Sarri – was appointed by Celtic last month amid some backlash in Scotland, but Bhoys fans are slowly starting to get an idea of why the former Australia manager is so highly rated.

With an emphasis on a high-octane style of attacking football and unrelenting belief in his philosophy, Postecoglou is the most decorated coach in Australian football history.

From South Melbourne to Australia and Japan, Postecoglou has won it all – a pair of National Soccer League championships, back-to-back A-League titles, a record 36-match unbeaten streak at Brisbane Roar, plus a ground-breaking 2015 Asian Cup triumph with the Socceroos and a J1 League crown with Yokohama F.Marinos - while silencing his doubters.

With fellow Australian Arthur Papas by his side in Yokohama, Postecoglou ended F.Marinos' 15-year wait for league glory in 2019.

As Postecoglou embarks on the biggest job an Australian coach has held in football, former assistant Papas – now in charge of A-League side Newcastle Jets – told Stats Perform: "It's a great achievement to be given a position of such stature.

"I'm ecstatic for Ange because the path to success is never a straight line. That is for everyone. The main thing is he's been consistent. Consistent in who he is as a person, how he approaches his work and what he believes in - and he believes in himself a lot.

"He is incredibly humble and hardworking, and full of self-belief. But he knows it's a big job, a difficult job. Celtic are another team who have fallen away in recent times and the pressure is immense, but I do think that's when he is at his best. He thrives under those conditions. It's a challenge after being so successful in Japan."

Postecoglou left F.Marinos with the highest winning percentage (49.2 – 58 victories in 118 games) in the history of the club. Since joining the Yokohama outfit, only two managers have a better winning percentage than Postecoglou from a minimum of 10 games: Toru Oniki (65) and Go Oiwa (50).

Despite the language barrier, F.Marinos bought into the Postecoglou way. Since 2018, the team ranked first for passing accuracy (86.5 per cent) and possession (63.2 per cent), while they were second for goals per game (1.9), expected goals per game (1.8), shots per game (15.2), shots on target per game (5.3), shot conversion rate (12.6), shooting accuracy (47.2), chances created per game (11.4), passes per game (619.4), passing accuracy in opposition half (82.4), big chance total per game (2.4), big chances created per game (1.8) and big chances scored per game (1.1).

Papas, who spent two seasons with Postecoglou at F.Marinos, added: "It's been well-documented the success in Japan but not really understood how difficult it is. People have asked me, for example, how will I deal with the pressure of being an A-League coach? I feel like saying, being in a country where not one player or staff speaks English and still getting a football message across and seeing it come to life so quickly, has more difficulty than maybe coming back here.

"Every job will have its challenge in the end. The main thing is [Celtic] have got themselves a world-class manager. A manager with a very clear philosophy and someone given the time, like every manager needs. Some use that time extremely well and you see progression, and others unfortunately – because the path isn't so clear, doesn't go that way. But given the time, he will be successful there for sure. He will be successful in his own unique way.

"Then, there will be another step after that because that's just Ange. He doesn't settle for that place and get comfortable. When he has had a bit of success, he wants more. That's why he is special at what he does."

Postecoglou, like Manchester City's Guardiola and former Chelsea and Juventus boss Sarri, pushes the boundaries. Firmly set in his belief of how football should be played, Postecoglou's approach never waivers and success follows the 55-year-old in his pursuit of excellence.

Asked about some of the initial negativity after Postecoglou's arrival at Celtic, Papas said: "Australian coaches, unfortunately, don't get start-up respect regardless, so there's always going to be someone that doubts you. What is important, is what you believe in about yourself.

"The thing is, he is so supremely confident in himself that it won't phase him. He knows it's just part of the challenge of where we are from and where we're going. He is a firm believer of it, we as Australian coaches probably get underestimated because of our passport not because of our competency. Having experiences across Asia, you see things and you're like wow.

"The passport unfortunately doesn't carry a lot of weight and definitely carries a lot of criticism at times, but he believes in himself.

"He will go there, it will take some time to engrain his ideas but there's no doubt they have a world-class manager that will turn that place upside down and get them on the right path."

During F.Marinos' triumphant season in 2019, Postecoglou's men covered the greatest distance in the J1 League (116.48km), ahead of Oita Trinita (114.79km). They also tallied the most total sprints with 191, more than FC Tokyo (174).

"Ange is the type that scours through every bit of information. If you're a staff member there, you need to be on top of everything because you'll get questioned at times about 'what was the data on this?', 'what were the statistics on this player?' He is obsessed with his work," Papas added.

"It doesn't matter how time progresses; he is just as obsessed as he's ever been in terms of details. There's a lot of work to get that engine going in the background to run that program in a way that he feels befits a world-class program."

Postecoglou oversaw a rebuild at the Roar and after asking to be judged a year from the time he replaced ex-Socceroos boss Frank Farina, his project culminated in the development of arguably the greatest footballing side the country had ever seen.

Playing an entertaining and possession-based brand of football, the Roar won the championship in 2010-11 and successfully defended their trophy the following season amid a 36-game unbeaten streak – an all-time Australian football code record for the longest undefeated run, surpassing rugby league outfit Eastern Suburbs' record set 74 years prior.

Postecoglou also coached Melbourne Victory before his Australia appointment in 2013. In the A-League, his teams scored 1.7 goals per game; only one head coach (minimum 30 games) has a higher average in the competition's history (Graham Arnold - 1.8).

The Greece-born boss left Australia's domestic competition with a 51 per cent win percentage as head coach – the joint-fifth best of any manager in the competition's history.

Named Australia boss in 2013, Postecoglou led Australia at the 2014 World Cup, conquered the Asian Cup the following year and also secured their position at Russia 2018 before stepping down. The Socceroos scored 86 goals in A-Internationals under Postecoglou – the second most they have scored under any manager since the beginning of 1965 (Frank Farina - 197).

Australia won 22 games during his tenure; only two managers have won more since the beginning of 1965 (Frank Farina - 34 and Holger Osieck - 23).

"I don't believe there is a certain timeline and it clicks," Papas said. "The process starts from day one and it's more about what is around you to implement that. Certain positions, you can go in and have the ability to make certain changes early on, which might fast track that progression. The only thing is that it's something that always grows and gets better. Because it's such a clear way of working and style of play that you're constantly working on everyday getting better at doing that.

"It's not, this week we're going to change it and sit back, these messages are so consistent that it just becomes something you get stronger at over time but that's why it takes a bit of time also. It's not a situational philosophy, it's a very clearly-defined progressive philosophy that has clarity and certain principles/frameworks that get reinforced on a daily basis."

"The biggest trouble with Celtic is trying to keep hold of Ange. In three or four years, you're going to have the same situation. He has won multiple titles and he will be trying to get a move to England or one of the big leagues. That is his pathway."

Ange Postecoglou is cut from the same cloth as Pep Guardiola and Maurizio Sarri – an emphasis on a high-octane style of attacking football, with an unrelenting belief in their philosophy.

But his appointment as Celtic manager has caused a stir in Scotland. Fans have questioned his ability and credibility to make the step from Asian to European football.

Postecoglou has been tasked with leading an embattled Celtic back to the Scottish summit after the Bhoys were dethroned by bitter rivals Rangers in 2020-21.

There are some parallels to legendary manager Arsene Wenger. Like Postecoglou, the Frenchman had history in Japan, having spent a year with Nagoya Grampus before being brought to the UK by Arsenal in 1996.

Social media was not around at the time of Wenger's Gunners arrival, though it would be safe to assume he would have been subjected to similar criticism from a supporter base desperate to wrestle the trophy back to Celtic Park.

Those questioning Postecoglou's pedigree should look no further than his CV – the most decorated coach in Australian football history, having also transcended and changed the landscape of the sport Down Under.

From South Melbourne to Australia and Japan, Postecoglou has won it all – a pair of National Soccer League championships, back-to-back A-League titles, a record 36-match unbeaten streak at Brisbane Roar, plus a ground-breaking 2015 Asian Cup triumph with the Socceroos and a J1 League crown with Yokohama F.Marinos, while silencing his doubters.

A former Australia international, Postecoglou – who delivered two NSL trophies within three years of his tenure in charge of boyhood club South Melbourne – truly announced himself at the helm of 'Roarcelona'.

After a brief and unsuccessful stint in Greece in 2008, followed by a short spell in the semi-professional state league in Victoria which resulted in relegation, Postecoglou landed in Brisbane the following year.

Postecoglou oversaw a rebuild and after asking to be judged a year from the time he replaced ex-Socceroos boss Frank Farina, his project culminated in the development of arguably the greatest footballing side in the history of Australian football.

Playing an entertaining and possession-based brand of football, the Roar won the championship in 2010-11 and successfully defended their trophy the following season amid a 36-game unbeaten streak – an all-time Australian football code record for the longest undefeated run, surpassing rugby league outfit Eastern Suburbs' record set 74 years prior.

Postecoglou also coached Melbourne Victory before his Australia appointment in 2013. In the A-League, his teams scored 1.7 goals per game; only one head coach (minimum 30 games) has a higher average in the competition's history (Graham Arnold - 1.8).

The Greek-born boss left Australia's domestic competition with a 51 per cent win percentage as head coach – the joint-fifth best of any manager in the competition's history.

Erik Paartalu was one of Postecoglou's first signings as Roar coach and the ex-Australia international told Stats Perform: "He will be absolutely buzzing. He isn't the type to take a job on lightly. He would've researched beforehand. I'm sure he's probably been offered jobs of this calibre before but wasn't ready.

"Ange has always been ambitious. This guy just doesn't stop. Any other Australian coach that would've won the J.League would've just stopped there and chilled out in Asia. The guy is in his mid-50s. He would've researched this whole situation at Celtic, who is leaving and who is coming, who can I get in? I know he's already thought about his next step from here."

"With Ange, it was the tactical side of it where he explained and broke things down so easily on the pitch, whether that be playing 11-v-seven, so you would have a huge overload and confidence in possession. Or if it was in a video session, always pointing out the good things about people," said Paartalu as he reflected on his Roar days. "He always pumped up the smaller details of the team. His way to getting us to feel, you just felt so confident."

Postecoglou, like Manchester City's Guardiola and former Chelsea and Juventus boss Sarri, pushes the boundaries. Firmly set in his belief of how football should be played, Postecoglou's approach never waivers and success follows the 55-year-old in his pursuit of excellence.

"That's what we loved about him," Postecoglou said. "We went on that unbeaten streak and then lost five in a row. Never even mentioned getting close to the record. It was just like 'if we play the way we play, we'll wipe this team off the park'.

"In the first grand final [2011 against Central Coast Mariners], the goal I scored in the last couple of seconds [of extra time, 120th minute to force penalties after 2-2 draw], it was the build-up before that showed everything that we're about. [Michael] Theo had the ball and could've gone long, but he throws it to [Massimo] Murdocca and we build up from the back and get a corner. That was so typical of the way he wanted us to play. Even in training, it was like, 'don't put the ball above waist height or in the air'. If you did that, you had to give the ball to the other team. So we were drilled into knowing short passes, through lines, everyone in the right position, movement off the ball, entry points on the edge of the box, guys overlapping, 4-3-3 and don't cross the ball in if you're not sure. That was his blueprint. We were going to play his way all the way to the death. When we lost five in a row, he never got angry. He was so clear, saying keep doing it, be confident, keeping passing the ball.

"He definitely improves players' game intelligence when they work under him. You feel 10-feet tall and just know your job inside and out because of the way he prepares you."

Handpicked to introduce style and substance to the Socceroos in 2013, Postecoglou led Australia at the 2014 World Cup. Undaunted by the 'Group of Death', Australia left Brazil emptyhanded, but took it to Chile, the Netherlands and holders Spain in stunning fashion.

Postecoglou delivered a first Asian Cup to Australia in 2015, while he secured qualification for the 2018 World Cup before stepping down prior to the Russian showpiece.

The Socceroos scored 86 goals in A-Internationals under Postecoglou – the second most they have scored under any manager since the beginning of 1965 (Frank Farina - 197). Australia won 22 games during his tenure; only two managers have won more since the beginning of 1965 (Frank Farina - 34 and Holger Osieck - 23).

Postecoglou eventually landed at F.Marinos – part of the City Football Group – in 2018.

Physical performance coach Gregory King was part of the team Postecoglou put together to accompany him on his journey in Japan, where he ended F.Marinos' 15-year wait for league glory in 2019.

Postecoglou left F.Marinos with the highest winning percentage (49.2 – 58 victories in 118 games) in the history of the club. Since joining the Yokohama club, only two managers have a better winning percentage than Postecoglou; Toru Oniki (65) and Go Oiwa (50) from a minimum of 10 games.

Despite the language barrier, F.Marinos bought into the Postecoglou way. Since 2018, the team ranked first for passing accuracy (86.5) and possession (63.2), while they were second for goals per game (1.9), expected goals per game (1.8), shots per game (15.2), shots on target per game (5.3), shot conversion rate (12.6), shooting accuracy (47.2), chances created per game (11.4), passes per game (619.4), passing accuracy in opposition half (82.4), big chance total per game (2.4), big chance created per game (1.8) and big chance scored per game (1.1).

"He definitely has a really good understanding from conditioning, strength and sport-science point of view," King told Stats Perform. "His attention to detail is optimal. You know you can't pull the wool over his eyes. He knows everything going on within his team but he lets you run your own department. He gives you a license to achieve the objectives of the team in your own way."

During F.Marinos' triumphant season in 2019, Postecoglou's men covered the greatest distance in the J1 League (116.48), ahead of Oita Trinita (114.79km). They also tallied the most total sprints with 191, more than FC Tokyo (174).

As Postecoglou prepares to take pre-season training with Celtic, King said: "They're definitely in for a lot of hard work. Really quality football sessions based around the principles of how he wants to play. But, there's no holding back in terms of intensity.

"I think they will enjoy the sessions, however they will be pushed physically. The football we played in Yokohama was extremely high intensity. The physical qualities have to be at their peak. We expected our best players to play regularly, so to be able to do that, the players have to have a lot of good hard work behind them and to be able to cope with it."

"I'd be very surprised if he wasn't looking closely at injury history, how many games they've been able to play over the past seasons in terms of durability. Speed is obviously a massive factor from the forwards and also the centre-backs being able to play really aggressive and a high line. You can only do so much when you have them. We feel we can improve them all physically but from a conditioning point of view, you have to recruit players strong in those areas already to be able to play the way we did."

Celtic have appointed highly regarded Australian coach Ange Postecoglou as their new manager after several months in limbo.

Neil Lennon resigned from the post in February with Celtic a huge 18 points adrift of bitter rivals Rangers in the Scottish Premiership.

His departure did nothing to prevent the Gers marching to the title, as they ended Celtic's hopes of winning nine league titles on the spin – Steven Gerrard's men doing so without losing a single match.

Numerous coaches were linked with the role, with Celtic even going as far as confirming they had held talks with former Bournemouth boss Eddie Howe but were unable to reach an agreement, reportedly caused by a differing of opinion regarding backroom staff.

Celtic finally have their man in Postecoglou, who was most recently with Yokohama F. Marinos, whom he guided to the 2019 J1 League title.

A Greece-born former Australia international, Postecoglou enjoyed continental success with the Socceroos' youth teams before then also guiding the senior team to Asian Cup glory – the country's first – in 2015.

A year earlier he was Australia's coach at the 2014 World Cup and he then secured their qualification for the 2018 edition, only to resign a couple of weeks after booking their place in Russia.

Upon signing a 12-month deal, Postecoglou said: "The opportunity that has been given to me is one of the greatest honours in football and the responsibility to lead our magnificent football club into the future is one that I will cherish dearly.

"Celtic is one of THE names in world football, of that there is no doubt – a giant of a club, a proper footballing institution and so much more – real history, real substance, real authenticity and real soul. I know Celtic is a true way of life for so many people and I know the demands which come with this position – I am ready to do all I can to meet those demands.

"I will be doing everything I can to get our great club back on top and, at the same time, deliver the kind of football which our fans appreciate. We want to entertain our fans and we want to win, these are the objectives which I always set myself and which I now begin work on."

Throughout his time in football management, Postecoglou – a former defender – has been renowned for implementing progressive, attack-minded systems and drawn praise for his sides' entertaining styles of play.

Postecoglou is only the club's second non-British manager this century after Ronny Deila of Norway, who spent two years in charge up to May 2016.