Tottenham simply have to put in the hard graft as they look to salvage something from what is turning out to be a disappointing end to the campaign.
Spurs' Champions League hopes appear to be fading fast after they lost for a third straight game in the Premier League, going down 2-0 at Stamford Bridge on Thursday.
Tottenham have four games remaining, albeit that includes meetings with Liverpool and Manchester City, and they are seven points behind fourth-placed Aston Villa.
They were particularly vulnerable from set-pieces once again, with both of Chelsea's goals coming from such scenarios.
Asked how Spurs can turn it around, Postecoglou said told BBC Sport: "Just hard work mate, there's no major formula. We will work hard and make sure we get it right."
He added: "It wasn't a great night for us. We didn't play at the levels we needed to and didn't deserve something from it.
"We lacked belief and conviction in our game. I don't know if it is low confidence but we are not playing with the mindset we need to play the football we want to and that is something I have to look at.
"It is on me to fix it. That is what we will be doing. We had bigger issues tonight than set pieces."
Speaking to Sky Sports, the Tottenham boss said: "I feel like we've lost a bit of belief and conviction in our football and that is on me to change that.
"It wasn't about conceding the [first] goal, it was our approach to playing football and we were nowhere near good enough. That is on me.
"We've been in a bit of a grind for a while now, that is part of our challenge and part of our growth. We have to go out there and perform and sometimes you have to grind out. We were poor today."
Spurs defender Micky van de Ven, meanwhile, conceded Champions League qualification looks out of sight.
"It will be difficult. I don't want to look up to the Champions League after this game, it was not a good performance from us and it is important we play a good game on Sunday," he said.
Mauricio Pochettino, meanwhile, became the first manager to complete a Premier League double over Tottenham having previously managed them in the competition.
Chelsea are up to eighth, just three points behind sixth-placed Manchester United.
"So happy and so pleased. So happy for our players," Pochettino said.
"The first half was fantastic. Then you have to contain and suffer. Tottenham have quality players. Not too much to say, all credit to the players."
Brighton confirm surprise departure of De Zerbi
Roberto De Zerbi will leave Brighton after the Seagulls' final game of the season against Manchester United on Sunday.
Brighton confirmed the surprising news on Saturday, revealing that the club and the Italian coach had mutually agreed to part company.
De Zerbi enjoyed great success in his first season with Brighton, guiding the club to Europe for the first time in their history after he took over from Graham Potter, who had left to join Chelsea.
Brighton had a strong start to 2023-24, but a series of injuries to key players left them depleted and, though they made it through their Europa League group, which also included heavyweights Ajax and Marseille, they were subsequently knocked out by Roma.
Their form in the Premier League has also dropped off, with Brighton managing just four wins since the turn of the year, and ahead of Sunday's meeting with United, the highest they can finish is 10th.
In fact, across their first 19 Premier League matches this season, Brighton were the fifth-highest scorers in the Premier League (38 goals) and had a conversion rate of 13.3 per cent.
However, in their last 18 games since the turn of the year, only Everton (15) have scored fewer goals than the Seagulls (17), with their conversion rate of 6.6 per cent the worst of any side in this time.
De Zerbi was linked with taking over at Liverpool following Jurgen Klopp's departure, but the Reds have instead turned to Feyenoord's Arne Slot.
Brighton chairman Tony Bloom said: "Roberto has given us two excellent seasons of service in which he has led the club to new heights, not least our first ever European campaign which will live long in the memory of Albion fans.
"We have mutually agreed to end Roberto’s contract at a time that suits both parties allowing us the earliest opportunity to plan for next season, and Roberto plenty of time to consider his next move and his future.
"I am sure our fans will give Roberto and his staff a wonderful and fully deserved send-off. In the meantime, I'd like to thank Roberto and his staff for all their hard work in the past two seasons. They all leave our club on good terms and with our very best wishes for the future."
De Zerbi said: "I am very sad to be leaving Brighton, but I am very proud of what my players and staff have achieved with the support of everyone at the club and our amazing fans in the past two historical seasons.
"We have agreed to end my time at Brighton so that the club and I can continue to work in the way that suits each of us best, following our own ideas and visions, as well as our work and human values.
"I have really enjoyed an intense and challenging two years working in the Premier League, not least competing in four major competitions this season. Leaving now provides me with time to take a break before deciding on my future plans."
Edwards urges Luton to 'reward' supporters on final day
Rob Edwards wants Luton Town’s players to "reward" the fans for their support throughout the season when they welcome Fulham on the final day.
The 18th-place Hatters' survival hopes are still mathematically alive, but they require an ambitious 12-goal swing to leapfrog Nottingham Forest, who are away at already relegated Burnley, in 17th.
Despite their immediate return to the Championship being all but confirmed, Luton have earned many admirers this season, scoring 50 goals along the way.
In a 20-team Premier League season, only Blackpool (55, 2010-11), Middlesbrough (51, 1996-97) and Leicester City (51, 2022-23) have netted more times during a campaign in which they were relegated.
Edwards has urged his players to give the supporters plenty to cheer about and, regardless of the end result on Sunday, is optimistic about the club's future.
"We want to reward them with a good performance and want to win the game," he said. "I think it will be really good atmosphere.
"Everything I have had from fans has been really positive. Everyone has been proud of players and club and what they have shown. We want to make it a really positive day with the performance as well.
"We have given everything and given a really good account of ourselves. We have shown Luton to the world in a really good light.
"I'm really proud of what we have done the past 18 months. The club is in a really healthy position. We have been saying since we arrived, this club is only going one way."
With Fulham safe in 14th and looking forward to a third successive season back in the Premier League, Cottagers boss Marco Silva also paid tribute to the spirit shown by the Hatters during their maiden campaign.
"It will be a really tough game for us," he said. “Even if they don't achieve [safety], they are going to fight to the maximum – and this reflects Rob and his staff.
"For them to fight until the end to stay up, shows how much they have improved. Their fans are proud of their team and you can see it every time they play."
PLAYERS TO WATCH
Luton Town - Alfie Doughty
With 42, Doughty has created the most chances from set-plays in the Premier League this season.
Meanwhile, only West Ham's James Ward-Prowse has registered more such assists (six) than the Luton full-back (five).
Fulham - Andreas Pereira
Pereira has created 84 chances in the Premier League this season, the most by a Fulham player in a single campaign (since 2003-04).
Meanwhile, his tally of seven assists is the highest by a Cottagers player in a single term since Simon Davies in 2007-08 (eight).
MATCH PREDICTION: DRAW
Both sides are on winless streaks; Luton failing to win any of their last five matches, and Fulham without victory in four attempts.
The Hatters have failed to win any of their last six league games against the Cottagers (drawn two, lost four), though both those draws have come in the two most recent meetings at Kenilworth Road.
Luton have only kept two clean sheets this season and conceded 81 goals – only letting more in during a top-flight campaign in 1982-83 (84).
While Fulham have kept two successive away clean sheets – after 12 straight games without one – they have not registered three in a row since a run of four in late 2008.
The Cottagers have not won their final league game in any of the last six seasons (drawing one, losing five), with a 2-1 win over Sheffield Wednesday in 2016-17 representing their most recent such success.
OPTA WIN PROBABILITY
Luton Town: 33.9%
Fulham: 37.7%
Draw: 28.4%
Late Palma strike sinks St Mirren as Celtic celebrate SPL triumph on final day
Luis Palma struck a late winner as champions Celtic twice came from behind to see off St Mirren 3-2 on the final day of the Scottish Premiership season.
It was a day of celebrations at Celtic Park for Brendan Rodgers' side, who wrapped up their third successive domestic title in midweek.
However, St Mirren threatened to spoil the party when Mark O'Hara fired them in front after just seven minutes.
Top scorer Matt O'Riley equalised for the hosts in the 21st minute, but they fell behind again just five minutes later when O'Hara doubled his tally from the penalty spot after Stephen Welsh fouled Toyosi Olusanya.
Kyogo Furuhashi levelled for Celtic before half-time, and the Hoops completed the turnaround with Palma scored the winner with four minutes remaining.
Rodgers' side finished eight points clear of second-place Rangers, who were held to a 3-3 draw by Hearts.
Despite falling behind to Lawrence Shankland's strike, goals from Ross McCausland, Todd Cantwell and Fabio Silva seemingly had the visitors on course for a comfortable win at Tynecastle.
However, there was to be a late twist with Dexter Lembikisa pulling a goal back in the 82nd minute, before Kyosuke Tagawa struck deep into stoppage time to rescue a point for the hosts.
There was also nothing to separate Dundee and Kilmarnock, who drew 1-1 in the other match on the final day.
Luke McCowan cancelled out Gary Mackay-Steven's earlier effort, though the Dundee captain squandered a glorious opportunity to complete the turnaround when he missed a penalty two minutes from time.
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