Barcelona have been drawn away to Granada in the Copa del Rey quarter-finals.

Ronald Koeman's team fought back to defeat second-tier Rayo Vallecano 2-1 on Wednesday, earning their place in the last eight after a major scare.

Barca will now have to face a LaLiga team in Granada, a side they defeated 4-0 at Los Carmenes earlier this month.  

Sevilla, who have not won the competition since 2010, will play away to Almeria, the last team from outside the top flight left in the tournament.

Real Betis will take on Athletic Bilbao, who are yet to play Real Sociedad in the final of last season's Copa, while the other match will see Levante host Villarreal.

Ties will be played across next week from Tuesday to Thursday, with Barca favourites to win it after Atletico Madrid and Real Madrid were eliminated against lower-league opposition.

England boss Gareth Southgate is to take part in a study exploring the links between football and dementia and has urged other former professionals to do the same.

The 50-year-old has volunteered to join the HEADING study, led by the London School of Hygiene & Tropical Medicine.

A second independently led study by the University of Nottingham, called FOCUS, is being backed by funding from the Football Association and Professional Footballers' Association.

It is hoped the research can further understanding of possible links between professional footballers and an increased risk of neurodegenerative disorders. Former England international Nobby Stiles had dementia when he died last year, while fellow 1966 World Cup winner Bobby Charlton has the disease.

"This is an incredibly important issue in our game and I'm very happy to play my part in supporting this research," Southgate said via the FA.

"Having turned 50 last year, I am now eligible to take part in the HEADING study, which could provide crucial and valuable insight to help people who play the game now and in the future.

"I would encourage any former professional footballer who is willing and able to take part in the HEADING or the FOCUS study to do so.

"Our involvement is absolutely essential if we are to have a greater understanding of this issue;

Roy O'Donovan scored his first goal as an Australian citizen to earn Newcastle Jets a 1-1 draw against Western Sydney Wanderers.

The former Republic of Ireland B striker fired in an 81st-minute penalty to give the lowly Jets the reward their second-half endeavour deserved.

Former Newcastle frontman Bernie Ibini, who left the Jets in December, had pounced in the 36th minute at Bankwest Stadium to give Wanderers the lead in the A-League clash.

Ibini drove home after Simon Cox went on a weaving run that ended with a 20-yard low shot against the left post, the ball bouncing out kindly for the experienced striker to convert.

Wanderers would have gone top of the table had they held on for three points, but after having much the better of the opening 45 minutes their level dipped in the second half.

Jets substitute Luka Prso was clipped in the penalty area by Patrick Ziegler, who was also freshly off the bench, and O'Donovan snatched the chance to secure a point, firing high into the left corner.

O'Donovan, 35, announced this week that his citizenship had come through, having spent the last five and a half years playing in Australia.

The point nudges Wanderers up to second place after five games, albeit having played one more match than the teams around them.

For the Jets it was a first draw of the campaign after one previous win and four defeats.

Chelsea are reportedly interested in Borussia Dortmund star Erling Haaland and Bayern Munich defender David Alaba. 

Haaland and Alaba have been linked with moves, with the latter almost certain to leave Bayern when his contract expires at the end of the season. 

Chelsea spent big last year – but they are apparently eyeing the pair.

TOP STORY – CHELSEA INTERESTED IN HAALAND AND ALABA

Chelsea are interested in signing Dortmund star Haaland and Bayern defender Alaba ahead of 2021-22, according to Sky Sports.

Real Madrid have been strongly linked with the duo, while Alaba is said to be a target for several other European giants.

Thomas Tuchel has replaced Frank Lampard at the helm for Chelsea, who are eighth in the Premier League.

ROUND-UP

- Jesse Lingard could join West Ham. Sky Sports reports they have offered a £1.5million loan fee and to pay Lingard's wages for the rest of the season to land him on loan from Manchester United.

- Amid reports Lucas Torreira could leave Atletico Madrid, where he is on loan from Arsenal, to join Monaco, it seems that may not be the case. Fabrizio Romano reports Monaco are not negotiating for Torreira.

- Bayer Leverkusen are confident of completing a deal for Leicester City midfielder Demarai Gray, according to Sky Sports.

- Struggling for game time at Arsenal, Ainsley Maitland-Niles could make a move. The Athletic reports West Brom are looking at the 23-year-old for a potential loan deal.

Mauricio Pochettino denied he had turned down chances to coach Real Madrid and Barcelona.

Pochettino has been linked with the LaLiga giants previously, although he took over at Paris Saint-Germain at the start of the month.

But Pochettino said reports he had turned down Madrid and Barcelona were untrue.

"This is not the case, although there was a lot of talk at the time," he told Marca.

"We have a lot of respect for the teams that may have been interested in our staff.

"It wasn't like that and of course I have been approached by clubs, but the one we received with love was from PSG. And this is the ideal project."

After spells in charge of Espanyol and Southampton, Pochettino was at the helm of Tottenham for five and a half years before being sacked in November 2019.

He has overseen four wins in five games since taking charge of PSG, who are top of Ligue 1 ahead of visiting Lorient on Sunday.

Paris Saint-Germain boss Mauricio Pochettino said every coach in the world would want a player of Lionel Messi's quality at their disposal.

Messi, 33, is out of contract at Barcelona at the end of the season and the six-time Ballon d'Or has been heavily linked to PSG and Manchester City.

Pochettino only took over at PSG at the start of the month but is already facing questions over Messi's potential arrival.

The former Tottenham boss, though, said every coach in the world would want Messi.

"Sometimes words are unnecessary. With the question you ask me, everything is understood," Pochettino told AS.

"What coach in the world would not want to have a player of the calibre of which you are telling me? I totally understand the question, but it is looking for a controversy.

"It is a dangerous question if a word of mine is taken out of context … Pochettino will come disrespectfully, Pochettino talks about this, Pochettino talks about that."

Pochettino has previously spoken of the bond he shares with Messi thanks to their connection to Newell's Old Boys, where both were in the youth system.

While the 48-year-old paid tribute to Messi, he is also preparing to meet the star forward when PSG face Barcelona in the Champions League last 16.

"There is nothing left to say. I respect and admire him so much that I prefer never to say anything or refer to him. It is the best tribute you can do to someone," Pochettino said. 

"We share the two of us who have worn the Newell's jersey and that is something very big. That bond unites us. 

"That he is one of the best players of all time I will not discover and when we meet we will fight for our interests."

Jurgen Klopp insisted Liverpool would only sign "the right player" despite their defensive problems increasing with the loss of Joel Matip to an ankle injury.

Matip missed the 3-2 FA Cup loss at Manchester United last Saturday but returned for Thursday's Premier League win at Tottenham, partnering Jordan Henderson in defence in the absence of Fabinho.

However, the Cameroon international had to be substituted at half-time of the 3-1 victory over Spurs with what Klopp later confirmed as ankle ligament damage.

With Virgil van Dijk and Joe Gomez long-term absentees and Fabinho struggling with another muscle problem, the Reds finished the match at Tottenham Hotspur Stadium with Henderson alongside the inexperienced Nat Phillips.

Klopp, though, is not prepared to sanction a new signing before the transfer window closes simply to add extra numbers to his squad.

"You can imagine that we think about everything, of course," he said. "We thought the whole time, we think the whole time, it's about doing the right thing.

"I'm not picky or whatever… but we need to find the right player. We have players still. Not a lot, to be honest, in the defence line it is incredible what's happening there, it's really incredible. But that's it."

Liverpool's convincing win over Jose Mourinho's men, delivered through goals from Roberto Firmino, Trent Alexander-Arnold and Sadio Mane, was just their second in eight games in all competitions.

Firmino's first-half opener ended a wait of 482 minutes for a Premier League goal, in which time the champions had attempted 93 shots without finding the net. 

"I am completely happy about the performance and, yes, it's about the boys," Klopp said. "They put a proper shift in. It was a brave performance in a game against a counter-attacking monster, which they are and that makes it even more special. For tonight, it was really good."

The win moved Liverpool back into fourth place in the table, four points behind leaders Manchester City, who have a game in hand.

Jose Mourinho fears Harry Kane could be out for "a few weeks" after the Tottenham captain injured both ankles in a 3-1 Premier League defeat to Liverpool on Thursday.

England striker Kane did not return for the second half at Tottenham Hotspur Stadium after requiring treatment twice in the opening 45 minutes.

Kane has been struck with ankle problems in the past and although Mourinho was unsure over the extent of the damage his talisman sustained, the Spurs boss is braced for having to cope without him in the short term at least.

Asked about Kane's injuries, the Portuguese told Match of the Day: "Two ankles, the first was a bad tackle, it was Thiago [Alcantara]. The second one I didn't know well.

"But two injuries in both ankles, the second one worst than the first one – a few weeks [out], I don't know.

"There are some players you can't replace. When it happens it happens but I believe we have to fight against it, we cannot do anything else."

Spurs face Brighton and Hove Albion on Sunday before taking on Chelsea in a London derby, then face clashes with Everton and Manchester City before coming up against Wolfsberger over two legs in the Europa League next month.

Their eight-match unbeaten run in all competitions was brought to a juddering halt by champions Liverpool, who rediscovered their goalscoring touch with strikes from Roberto Firmino, Trent Alexander-Arnold and Sadio Mane.

Pierre-Emile Hojbjerg had made it 2-1 with a stunning first goal for Spurs after Alexander-Arnold capitalised on a mistake from Hugo Lloris early in the second half.

Son Heung-min had an early goal disallowed for offside after Mane missed a glorious early chance to open the scoring and Mourinho felt Tottenham only had themselves to blame for a defeat that leaves them eight points behind leaders City in sixth place.

"My analysis is that we started very well, but before we scored the offside goal we showed immediately what the game was going to be for us – a big occasion for Mane, a big defensive mistake," he said.

"That was the game for us, the team in the first half was very well organised, the goal is another mistake in the same position.

"The second half we had to make changes, we lose Harry, had to change the structure of the team. First minute, same mistake, second goal. Good reaction, another mistake and goal.

"It was a team fighting against its own mistakes. Some individual mistakes that you saw, you can replay and I cannot say much more than that."

Kylian Mbappe will be at Paris Saint-Germain "for many years to come", according to head coach Mauricio Pochettino.

Real Madrid have been heavily linked with a move for World Cup-winning attacker Mbappe, whose contract with PSG is due to expire at the end of next season.

The 22-year-old has scored 106 goals and set up a further 54 in 147 appearances for PSG. Since his debut for the club on September 8, 2017, the only players in the top five European Leagues to have registered more goal involvements are Robert Lewandowski (184) and Lionel Messi (205).

Mbappe is in talks with the club about a renewal but has never hidden his admiration for Madrid boss Zinedine Zidane.

Pochettino is not worried, though, and believes Mbappe's future is at the Parc des Princes.

"Who doesn't love Kylian? He makes himself loved, with his smile, his face and his energy," Pochettino told Marca.

"At the age of 19 he was a world champion [with France], impressive things have happened to him, but he is special and different, with a lot of emotional intelligence.

"He has a lot of potential to develop but he is already [someone for the] present, not just the future. It's a challenge and a good thing to work with this kind of talent, it makes you a better coach. You give this type of player a solution and he gives you five back.

"There are a lot of rumours, but I think he will be at PSG for many years to come, and that's the club's hope. We are counting on him for as long as we are here.

"It's true that he has to make a decision [on his future], but he seems happy and very committed to this project."

PSG are open to the possibility of signing Messi from Barcelona, with the six-time Ballon d'Or winner able to leave Camp Nou on a free at the end of the season.

Asked if having Messi in his team would make him a better coach, Pochettino replied: "Whatever I say will be misunderstood, and I love what I have. Great footballers fit in any league and any team."

He was far more forthcoming when discussing Sergio Ramos, another high-profile player that will be a free agent at the conclusion of the campaign if he does not sign an extension with Madrid.

"After one month [at PSG] I am finding players with great leadership. The great [players] are able to play and coexist in different projects and cultures, but I am very respectful," said Pochettino.

"PSG's strategy has been the same for years, ever since we signed Ronaldinho: to look at market opportunities and bring in those who can improve what we have. We will see in the coming months.

"Here, Ramos would find a great club with the obsession to always win. PSG are one of the biggest [clubs] in the world."

Eduardo Camavinga may have long been linked with a move to Real Madrid but the teenage midfielder wants to sign a contract extension at Rennes.

Madrid and Juventus are believed to be admirers of the 18-year-old midfielder, whose deal at Roazhon Park is due to expire at the end of next season.

Among midfielders currently aged 21 or younger to have played in at least 10 games in the top five European leagues this season, only Monaco's Aurelien Tchouameni (780) has made more successful passes than Camavinga (728). However, the Rennes talent has a superior passing accuracy of 89.9 per cent compared to his counterpart's 82.1.

His average of 3.9 tackles per 90 minutes is only bettered by Huesca's Sergio Gomez (4.4), though the Spaniard has played 345 minutes compared to Camavinga's 1,224. When disregarding the age of the player, Camavinga ranks ninth for total tackles.

It is easy to see why Rennes are keen to tie him down to fresh terms and it is something the France international is open to.

Asked if he wanted to extend his contract, Camavinga replied: "Yes.

"There are negotiations. Afterwards, there is my father to talk about that. There is a reflection on everything.

"It's you [the media] who see me go. Me, for now, I am 100 per cent focused on the club."

Camavinga became the youngest player to be capped by France in 106 years when he made his senior international debut last September.

The following month he became the second youngest goalscorer for Les Bleus when he found the net against Ukraine aged 17 years and 11 months.

Martin Odegaard was always fighting a "lost battle" with comparisons to Lionel Messi but has the characteristics needed to flourish at Arsenal, says Mikel Arteta. 

The Gunners completed a deal to take Odegaard on loan from Real Madrid until the end of the season on Wednesday, handing the attacking midfielder the number 11 shirt that was worn by Mesut Ozil when he joined the club. 

Odegaard was signed by Los Blancos from Stromsgodset as a prodigious teenager and has had loan spells in the Eredivisie with Heerenveen and Vitesse before impressing in a temporary stint with Real Sociedad last term. 

Madrid opted to recall him for the 2020-21 campaign, though the 22-year-old struggled to nail down a regular spot in Zinedine Zidane's team. 

Arteta is excited by Odegaard's qualities but did urge caution, saying comparisons to Barcelona great Messi are unhelpful. 

"I wouldn't even get close to that name you just mentioned [Messi] because it's a lost battle in my opinion. Martin is Martin," Arteta said when previewing Saturday's clash with Manchester United. 

"In the last few seasons he's progressed and developed in the right way. I follow him very closely because he played for Real Sociedad which is my hometown and I know him really well. 

"He's such a talent. He needs the right environment, a little bit of time, but he's got the qualities to be a success for us. He's a specialist to playing in the pockets, to be in the number eight, number 10 positions. 

"He can play on the sides, a really creative player, really comfortable on the ball in tight spaces, the capacity to create chances, to score goals. 

"Something he has improved a lot is his work rate without the ball as well. It's another option to give us more creativity in the final third."

Last season, Odegaard topped Sociedad's squad for chances created in LaLiga, crafting 62 opportunities in total as he provided six assists from 31 appearances. He also boasted an impressive passing accuracy of 84.74 per cent. 

This term he has been afforded just three LaLiga starts by Zidane, albeit Arteta made clear several factors will determine whether a permanent deal will be struck. 

"He has certainly all the qualities and characteristics that we are looking for," he added. 

"Then it would be down to two things – first of all, how well he adapts here and how much of an impact he can have in our team, and second, what Real Madrid and the player thinks about it because he's owned by Real Madrid and the player has a big say on that. 

"I just wanted to give him a clear picture of who we are as a club, what we are trying to do, what we expect from him, just try to transmit the passion and excitement that we had to bring him in. 

"I wanted to show him the project, how he fits and just try to persuade him that this is the right place for him and try to make things work." 

Arsenal are on a six-match unbeaten run in the Premier League to improve their previously precarious top-flight standing to ninth. 

They welcome a Manchester United side who saw their own 13-match unbeaten league run surprisingly ended by rock-bottom Sheffield United on Wednesday. 

"It's not a surprise because to beat any team in this league is extremely difficult and it's not taken for granted," Arteta said when asked about that game.  

"Sheffield United are a really good threat and you see that. They've lost games they didn't deserve to lose." 

Arsenal were the last side to beat United in the league before the Blades' unlikely triumph, while they have not lost to the Red Devils since an FA Cup defeat in January 2019. 

Still, Arteta says there is nothing to be gleaned from a decent recent record against United. 

"I think every game is completely different, they have the capacity and the quality to beat any side in the world, we know we’re going to have to be at our best," he said. 

"The games are huge, we need to be better than what we were on Tuesday [a 3-1 win at Southampton] to beat them. 

"They've been in top form. They've been top of the table playing really well. We know they are a real threat. We have to be at our best to beat them on Saturday."

Martin Odegaard was always fighting a "lost battle" with comparisons to Lionel Messi but has the characteristics needed to flourish at Arsenal, says Mikel Arteta. 

The Gunners completed a deal to take Odegaard on loan from Real Madrid until the end of the season on Wednesday, handing the attacking midfielder the number 11 shirt that was worn by Mesut Ozil when he joined the club. 

Odegaard was signed by Los Blancos from Stromsgodset as a prodigious teenager and has had loan spells in the Eredivisie with Heerenveen and Vitesse before impressing in a temporary stint with Real Sociedad last term. 

Madrid opted to recall him for the 2020-21 campaign, though the 22-year-old struggled to nail down a regular spot in Zinedine Zidane's team. 

Arteta is excited by Odegaard's qualities but did urge caution, saying comparisons to Barcelona great Messi are unhelpful. 

"I wouldn't even get close to that name you just mentioned [Messi] because it's a lost battle in my opinion. Martin is Martin," Arteta said when previewing Saturday's clash with Manchester United. 

"In the last few seasons he's progressed and developed in the right way. I follow him very closely because he played for Real Sociedad which is my hometown and I know him really well. 

"He's such a talent. He needs the right environment, a little bit of time, but he's got the qualities to be a success for us. He's a specialist to playing in the pockets, to be in the number eight, number 10 positions. 

"He can play on the sides, a really creative player, really comfortable on the ball in tight spaces, the capacity to create chances, to score goals. 

"Something he has improved a lot is his work rate without the ball as well. It's another option to give us more creativity in the final third."

Last season, Odegaard topped Sociedad's squad for chances created in LaLiga, crafting 62 opportunities in total as he provided six assists from 31 appearances. He also boasted an impressive passing accuracy of 84.74 per cent. 

This term he has been afforded just three LaLiga starts by Zidane, albeit Arteta made clear several factors will determine whether a permanent deal will be struck. 

"He has certainly all the qualities and characteristics that we are looking for," he added. 

"Then it would be down to two things – first of all, how well he adapts here and how much of an impact he can have in our team, and second, what Real Madrid and the player thinks about it because he's owned by Real Madrid and the player has a big say on that. 

"I just wanted to give him a clear picture of who we are as a club, what we are trying to do, what we expect from him, just try to transmit the passion and excitement that we had to bring him in. 

"I wanted to show him the project, how he fits and just try to persuade him that this is the right place for him and try to make things work." 

Arsenal are on a six-match unbeaten run in the Premier League to improve their previously precarious top-flight standing to ninth. 

They welcome a Manchester United side who saw their own 13-match unbeaten league run surprisingly ended by rock-bottom Sheffield United on Wednesday. 

"It's not a surprise because to beat any team in this league is extremely difficult and it's not taken for granted," Arteta said when asked about that game.  

"Sheffield United are a really good threat and you see that. They've lost games they didn't deserve to lose." 

Arsenal were the last side to beat United in the league before the Blades' unlikely triumph, while they have not lost to the Red Devils since an FA Cup defeat in January 2019. 

Still, Arteta says there is nothing to be gleaned from a decent recent record against United. 

"I think every game is completely different, they have the capacity and the quality to beat any side in the world, we know we’re going to have to be at our best," he said. 

"The games are huge, we need to be better than what we were on Tuesday [a 3-1 win at Southampton] to beat them. 

"They've been in top form. They've been top of the table playing really well. We know they are a real threat. We have to be at our best to beat them on Saturday."

Kai Havertz has all the qualities to be "world class" but was always likely to need time to settle in at Chelsea, according to Bayer Leverkusen's sporting director Simon Rolfes.  

The Blues spent a reported £72million (€80m) to bring the Germany international from Leverkusen in September, yet he has so far struggled to justify the hefty price tag.  

The attacking midfielder was one of several big-money signings during a busy close-reason recruitment drive, with compatriot Timo Werner - who arrived from RB Leipzig - also enduring a difficult start to life at Stamford Bridge. 

Havertz has managed five goals and five assists, as well as 23 chances created (1.4 per 90 minutes) and five big chances created (0.3 per 90) in 25 appearances so far in 2020-21.  

For comparison, during his final season at Leverkusen, he registered 18 goals (0.43 per 90), nine assists (0.21 per 90), 84 chances created (1.99 per 90), 20 big chances created (0.47 per 90) from 45 appearances.  

Chelsea's struggles on the pitch this term saw club legend Frank Lampard sacked and replaced by Thomas Tuchel, and Rolfes feels it is unfair to focus purely on Havertz, who he is backing to show his true abilities in the Premier League.

"It's always difficult if you change country and a little bit of a different style. That's the same if we sign players," Rolfes told Stats Perform News. 

"Some players need two days, some guys need half a year. For example, Moussa Diaby needs three-four months to adapt from France, although he was playing for PSG, to adapt to the Bundesliga.  

"You have to have in mind when you sign players, that not everybody is directly from the first day there.  

"I've followed Chelsea a little bit from a distance, but it's not only Kai or Timo Werner struggling a little bit, it's also the team – they expected more from the whole squad.  

"That's not so easy if it's not working in the team and you come in as a new player. It's much easier if the team is working and you step in your best position.  

"That's a process for Kai, to adapt to England and the Premier League. There is no doubt Kai is a fantastic player and has all the ability to play on the world-class level and although it's probably not his best six months, there is no doubt in my opinion."

Kylian Mbappe wants time to make a decision on his future as Real Madrid await a signal from the Paris Saint-Germain star.

Mbappe, 22, has been linked with a move to Madrid and his contract at PSG ends in 2022.

But will the forward end up at the Santiago Bernabeu?

TOP STORY – REAL MADRID WAIT FOR MBAPPE

Real Madrid are waiting for a signal from Paris Saint-Germain star Kylian Mbappe, according to Marca.

The report says Mbappe has asked for time to decide his future.

While Madrid have been most strongly linked with a move for Mbappe, Liverpool are also reportedly interested.

ROUND-UP

- Staying at Madrid and Fabrizio Romano says a new contract for midfielder Luka Modric is imminent. The Croatian midfielder's current deal expires at the end of the season.

- Dele Alli's future is set to be a constant talking point until at least the end of this transfer window. ESPN claims Tottenham chairman Daniel Levy is reluctant to let the midfielder leave for PSG. Romano reports Spurs are still looking for a replacement and were working on re-signing Christian Eriksen, but Inter wanted a loan fee and the midfielder's salary paid in full.

- Lyon star Houssem Aouar was linked to Arsenal last close season, but the midfielder could head elsewhere. Gianluca Di Marzio reports Juventus are looking at the 22-year-old as an option ahead of the 2021-22 campaign.

- Lucas Torreira seems set to move on from Atletico Madrid. Diario AS says Monaco are favourites to sign the midfielder, who is on loan at Atletico from Arsenal.

- Said Benrahma has made an impression at West Ham. Sky Sports reports West Ham have converted their loan for Benrahma from Brentford into a permanent move, paying £20million plus add-ons. The report says West Ham are also in talks to sign RB Leipzig forward Hwang Hee-chan.

"There is a spirit in the team but also the club – a dynamic in the last months and last years. That should lead us one day to a title, that's our big goal."

Bayer Leverkusen are one of Germany's biggest clubs, but not since the 1993 DFB-Pokal have they celebrated silverware.

Leverkusen have come close on numerous occasions in the Bundesliga – runners-up in 1997, 1999, 2000, 20002 and 2011, while they also reached the 2002 Champions League final, succumbing to Zinedine Zidane's iconic volley in Glasgow.

There were also runners-up appearances in the DFB-Pokal – 20002, 2009 and 2020. But an exciting and entertaining Leverkusen, even in the post-Kai Havertz era, are on the right track amid Bayern Munich's domestic and European dominance.

Leverkusen sporting director Simon Rolfes told Stats Perform News: "It's not easy if you're playing with the best team in the world – Bayern – but we have made a step forward and quite close to the top. We want to go forward. If it happens this year, fantastic. But we want to proceed and develop the squad, and mentality."

When star Havertz left for Chelsea at the start of the season in a transfer that could rise to €100million, and Kevin Volland joined Monaco, it left a noticeable hole at BayArena, where the pair scored 30 goals across all competitions in 2019-20.

But led by prodigy Florian Wirtz and a thrilling core of players, including Moussa Diaby, Leon Bailey and Nadiem Amiri, Leverkusen are continuing to challenge this term.

Leverkusen are third in the Bundesliga – three points behind RB Leipzig and 10 adrift of reigning champions Bayern – while Peter Bosz's side are preparing to face Young Boys in the Europa League last 32 and Rot-Weiss Essen in the DFB-Pokal round of 16.

With Havertz having departed, Leverkusen have a better goals/game ratio (2.5) through 26 games across all competitions this season, compared to 1.8 in 2019-20. The club have also improved defensively – goals conceded/game (1.0) and expected goals against (1.0) are better than last term (1.3) and (1.4) respectively.

Collecting 32 points, Leverkusen have played the best first half of a Bundesliga season for seven years – they collected 37 points at this stage in 2013-14.

Leverkusen have also exceeded their xG value of 23.1 to almost nine goals (8.9) – only Bayern have a greater margin between goals and xG (13.9). 

"In general yes because it's a chance for other players to develop and take more responsibility in the team and on the pitch," Rolfes, who was appointed in 2018, said when asked if he was always confident following the exits of Havertz and Volland. "We had the view that there could be other players who could take a step forward. The only thing for sure is Havertz is a world-class player, a fantastic guy and player. It's very difficult to replace him, so we said, it's not our direction to find a replacement for Kai because you will never find that replacement.

"We said okay, we will give our own players the chance to grow, this strategy works out very fast. It's always a risk for sure, but we have the confidence in those players to make a step forward, and also the team. If your superstar is gone, everyone knows we have to give more.

"We try to build-up, play offensive with ball possession, straightforward – the kind of style we showed against Borussia Dortmund [2-1 on January 19] is what we want. We want to have the ball, a lot of clubs and trainers are speaking to play without the ball, in Germany it's very popular, but we want to have the ball and want players who want the ball."

The emergence of teenage sensation Wirtz, and development of Diaby, Bailey, Edmond Tapsoba and Amiri, has further highlighted Leverkusen's successful recruitment and philosophy, which has become synonymous with German clubs.

"You have to have a clear strategy," Rolfes, who made almost 400 appearances for Leverkusen between 2005 and 2015, said. "A clear strategy of recruitment but also your playing style. That's really important for players but also the success of a club – both are strongly connected. For your playing style, you have to sign the right players. Then you have the chance that the players adapt quicker and develop better in your system because they feel comfortable in the way of playing. That's crucial.

"We know the Bundesliga, financially solid, but we are not at the top that we can sign every player, we have to develop players. The strategy is to recruit good players for our style and develop them to the top. Some clubs in Germany are quite successful with this."

"We are focusing on that talent and try to find them," he said. "We analyse millions of data with artificial intelligence, to pre-select and be early. It's not because we know players other clubs do not know, maybe 20 years ago, but everything is transparent. But you have to find them a bit quicker, but also clear in your playing style and what can they develop with your training work, in which areas they can develop in weak points. Because we are not signing players where everything is 100 per cent, we know they have weak points, but we know we have to work with them on that."

Data and AI continue to play a huge role in football, with Rolfes adding: "It's very important and because the data will be better and better, it will become much more important in the future because you will get better results. We are working with our own team on scouting, preparing for next matches – just in our daily work."

The likes of Michael Ballack, Toni Kroos, Bernd Leno and Havertz have all made names for themselves at Leverkusen, and Rolfes continued: "We count on the young players [at Leverkusen]. We give them trust and the opportunity to play. For example, Wirtz, we give him the chance to replace Havertz and not sign another star to put in front of him. That is one thing.

"We have a very professional environment, we really take care of the guys – try to develop them, work on the pitch and prepare them for top football. We have an advantage that the media surrounding is not so big here. That's good for young players to have a familiar environment where they feel very comfortable and less stressful, then try to reach the best level on the pitch."

Wirtz is the heir apparent to Havertz, having made an immediate impact after the 17-year-old swapped Cologne for Leverkusen in 2020.

Having made his debut in May 2020, Wirtz became the youngest goalscorer in Bundesliga history the following month, finding the net in a 4-2 defeat to Bayern after coming on as a substitute. Dortmund's Youssoufa Moukoko has since snatched that record.

Among all players with at least 50 dribbles in this season's Bundesliga, only Augsburg's Daniel Caligiuri has a better dribbles success rate (70 per cent) than Wirtz (65 per cent). 

Wirtz is one of 50 players born in 2003 or earlier to appear in Europe's top five leagues this season. Those 50 players have collected a total of 14 goal involvements – with seven of them coming from Wirtz. 

Among all players in Europe's top five leagues born in 2003 or earlier, Wirtz played the most minutes in all competitions this season (1,579) and had the most goal involvements in all comps (11 – six goals and five assists). 

"I saw him for the first time at 13. Now I have to say, he is playing Bundesliga the same way he was playing at 13, 14, 15, 16 – I followed him all the years. I always said okay, that's the player for us, the player for Leverkusen. That was not a surprise for me when he came to us and adapted very quick to our style," former Germany international Rolfes said.

"It was also one argument I said to him during the transfer. I said, 'you are a player for us, you will develop your skills and strengths much better because that's what we need in our style'. His development is fantastic."

Like Havertz, Bailey could be the next Leverkusen star to leave amid constant speculation over his future.

The 23-year-old winger, who has scored four goals and supplied five assists in the 2020-21 Bundesliga so far, has been linked with the likes of Manchester United and Manchester City and Rolfes is unwilling to sell the Jamaican to just any club.

"He's played a fantastic season," Rolfes said. "He struggled a bit last season, but he is performing at a very high level. A good guy in the squad. He has a chance to score goals for sure. A fantastic technique. That's part of lives also, to sell players but we want to sell to the top eight clubs in the world, but not to other clubs. Sometimes a player will leave us. We have a contract with Bailey but we are quite relaxed."

Diaby is another prime example for Leverkusen, where the accelerating Frenchman has 561 sprints in the league this season, more than any other player. 

The former Paris Saint-Germain speedster has been involved in 15 goals in all competitions in this season (in 26 games) – with his next goal involvement the 21-year-old would already reach his value from his first season in Leverkusen (16 in 39 games). 

"When we extended the contract until 2025, that was a really nice Christmas present to extend the contracts of Diaby, Tapsoba and Wirtz," Rolfes said. "[Diaby] is a key player of our squad. His acceleration and speed is outstanding. He has developed on scoring and assisting. To use his acceleration on a top, top level. He has potential to develop further. I'm very, very happy he is part of our squad."

Meanwhile, Timothy Fosu-Mensah could be the latest success story for Leverkusen, who also completed the signing of Netherlands Under-20 international Jeremie Frimpong from Celtic on Wednesday.

After joining Manchester United's academy in 2014, the 23-year-old called time on his Old Trafford stay in January, and Rolfes said: "He is not so young but the last two years, you had the feeling there was more in the box than there was in the last two years. That's interesting for us, to sign that kind of player where you have the feeling they can reach more. We want to help him.

"Timothy is a really good guy, ambitious guy. I like this. He has the ability, the physicality, very fast, a good technique. A lot of fundamental things that are important for our playing style. Then if the mentality and ambition isn't right, then let's work on that to develop you. I'm convinced Timothy can be the next example for our club."