The Zlatan delivery is so inscrutably deadpan that you are left searching the contours of the man’s face for the remotest trace of a grin that never comes.

“Would it be going downhill if you left Manchester United?” he is asked, amid a gloriously memorable nine-minute encounter in the depths of Wembley stadium late on Sunday. “For me or the club?” he replies.

In that moment, you know how his team-mates feel. Though the Swede’s presence has made him the one the younger players look up to – in precisely the same way that Eric Cantona was for the young Beckham, Scholes, Giggs and the Nevilles – the unreadable Ibrahimovic humour is perhaps most distinctive characteristic of all. The extended wind-up of a team-mate by him will begin in the Carrington dressing room and everyone will be waiting for the smile which puts the player out of his misery. The way this binds the squad is apparently monumental.

But behind the comic timing, an indignation resides which seems to be no laughing matter. It materialises when this correspondent puts it to him that this chapter in his 17-year career might be the most satisfying of all, given that he has proved himself in perhaps the toughest football environment of them all.

“I was not worried about age because I know what I am able to do,” he replies. “It is because I am here in England. After all these years [of people saying] ‘He didn't come and show himself here' but I came. And I came when people thought it was impossible for me to do what I am able to do.”

He returns to this theme often. “According to many I could not do what I’ve been doing.” And: “The important thing is what I believed. And: “People have something else to say?”

Zlatan Ibrahimovic's incredible 15-year trophy streak Show all 16 1 /16 Zlatan Ibrahimovic's incredible 15-year trophy streak Zlatan Ibrahimovic's incredible 15-year trophy streak Ajax, 2001/02 Eredivisie, KNVB Cup Getty Zlatan Ibrahimovic's incredible 15-year trophy streak Ajax, 2002/03 Johan Cruyff Shield Getty Zlatan Ibrahimovic's incredible 15-year trophy streak Ajax, 2003/04 Eredivisie Getty Zlatan Ibrahimovic's incredible 15-year trophy streak Juventus, 2004/05 Serie A (later revoked due to Calciopoli scandal) Getty Zlatan Ibrahimovic's incredible 15-year trophy streak Juventus, 2005/06 Serie A (later revoked due to Calciopoli scandal) Getty Zlatan Ibrahimovic's incredible 15-year trophy streak Internazionale, 2006/07 Serie A, Supercoppa Italiana Getty Zlatan Ibrahimovic's incredible 15-year trophy streak Internazionale, 2007/08 Serie A Getty Zlatan Ibrahimovic's incredible 15-year trophy streak Internazionale, 2008/09 Serie A, Supercoppa Italiana Getty Zlatan Ibrahimovic's incredible 15-year trophy streak Barcelona, 2009/10 La Liga, Supercoppa de Espana, Super Cup, Club World Cup Getty Zlatan Ibrahimovic's incredible 15-year trophy streak Milan, 2010/11 Serie A Getty Zlatan Ibrahimovic's incredible 15-year trophy streak Milan, 2011/12 Supercoppa Italiana Getty Zlatan Ibrahimovic's incredible 15-year trophy streak Paris Saint-Germain, 2012/13 Ligue 1 Getty Zlatan Ibrahimovic's incredible 15-year trophy streak Paris Saint-Germain, 2013/14 Ligue 1, Coupe de la Ligue, Trophee des Champions Getty Zlatan Ibrahimovic's incredible 15-year trophy streak Paris Saint-Germain, 2014/15 Ligue 1, Coupe de France, Coupe de la LIgue, Trophee des Champions Getty Zlatan Ibrahimovic's incredible 15-year trophy streak Paris Saint-Germain, 2015/16 Ligue 1, Coupe de France, Coupe de la LIgue, Trophee des Champions Getty Zlatan Ibrahimovic's incredible 15-year trophy streak Manchester United, 2016/17 EFL Cup, Community Shield, Europa League Getty

So often, in fact, that you think: ‘Who are these ‘people’? Look as hard as you like and you will find none. Very few declared that Ibrahimovic was not cut out for England, though very few said he was, either – and that is the significant point. His arrival drew attention for the pay packet - £250,000-a-week for a 34-year-old – rather than any kind of anticipation that he would be to Mourinho’s first season what Robin van Persie was to Sir Alex Ferguson’s last.

The doubts about Ibrahimovic and England always cropped up when he was facing English teams in the Champions League. By the time he faced Manchester City for Paris Saint-Germain last year, he’d scored just five goals in 20 appearances against English opposition.

There was the quite monumental 15-minute hat-trick against Roy Hodgson’s England in 2012, despatched at a time when the visiting fans in Stockholm had just started singing: “You’re just a shit Andy Carroll” but the sense pervaded of a flat-track bully. The English journalists were in attendance when Portugal defeated Sweden in their World Cup qualifier in 2013 and saw Ibrahimovic score twice but still find himself eclipsed by Cristiano Ronaldo.

The point he has to prove makes this English swansong deliciously addictive to him, though he does not disclose that when he holds court, of course. “I never talk so much with journalists. I never stopped so long even for the French people,” he says, during the Wembley interview which includes the unforgettably comical experience of trying to pin him down on why he feels he is a lion. (“I am a lion. I don’t want to be a lion. The lion is born a lion.”)

The fact he agrees to talk so much is the significant part. Almost to a man, Jose Mourinho’s newly-minted League Cup winners marched out Wembley without even mustering the good grace to say ‘no thanks’ when asked if they would stop for interview. Marcus Rashford, aged 19, was just too cool for school. Ibrahimovic saved the day as he so very often does. He described himself as “old school” and that seems to go for a recognition that those who write about players might warrant a second’s eye contact.

The Swede said everything - and yet, nothing. Could he score 40 goals this season?

“I will let you know when I am finished.” Will he sign a one-year contract extension. “We’ll see.”