He added: 'I don't know this is boxing it's a amusing thing - he may need surgery after what happened to his nose.
"If it's not Deontay Wilder then it will be Dillian Whyte on April 13".
Such concerns were put to bed however as Joshua moved in on his first chance to end Povetkin's challenge in the 7th.
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Mendy accompanied a picture of himself posing with Joshua's belts with the caption: "Just when you thought I didnt win enough trophies in 2018" in reference to the fact that he won the Premier League title and the Community Shield with City and the World Cup with France.
It forms part of a packed line-up of great fights coming up soon, with Saul "Canelo" Alvarez fighting "GGG" Gennady Golovkin, Anthony Joshua vs Alexander Povetkin and even Floyd "Money" Mayweather set to face Manny Pacquiao once more.
Joshua's fight with Povetkin takes place at Wembley Stadium on Saturday night.
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"They mentioned if it's not [Deontay] Wilder it'll be [Dillian] Whyte, there's no mention of Tyson Fury, the lineal heavyweight champion of the world".
Joshua opened up the third round with a solid short right hand, but Povetkin was able to answer with an over the top right hand. He started well, too, exploding out of the blocks to land a few good shots, and produce blood from Joshua's nose.
"If you look close enough you can see Joshua shout 'this is for Salisbury spire!'" "Tonight was about getting that big banana skin of Alexander Povetkin out the way".
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When you have Firmino, it's always like 'come on....' [let's play him] but Daniel paid 100 per cent back. With Bobby [Firmino] obviously struggling, Studge [Sturridge] comes in and scores for us.
'Povetkin was going to be sharp early, but AJ between 5 and 7 rounds.
Joshua, 28, originally from Watford but now living in north London and training in Sheffield, was more composed in the fourth round and his work left Povetkin cut above his left eye.
The loss was just the second of 39-year-old Povetkin's 36-fight career - his only other defeat was to Wladimir Klitschko, who Joshua scored a TKO win over last year to claim three of his four world titles.
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