John Fury, the father of WBC heavyweight champion Tyson Fury, is backing Anthony Joshua to "walk straight through" mandatory challenger Oleksandr Usyk when they collide in two months.

Joshua will defend the WBA, WBO, IBF, IBO heavyweight titles against Usyk at Tottenham Hotspur Stadium on September 25.

Usyk unified the entire cruiserweight division in 2018, when he outboxed Murat Gassiev for a twelve round unanimous decision win in the final bout of the World Boxing Super Series cruiserweight tournament.

Usyk moved up to the heavyweight ranks the following year.

John Fury believes size will matter in the upcoming bout.

While his brother Peter Fury views Usyk as a 'serious threat' in the upcoming bout, John Fury does not believe the unbeaten boxer will have the power or the physicality to deal with a very big heavyweight like Joshua.

"Usyk is good. He's a world-class cruiserweight, [he's] proved it. But AJ is a big dude and he's got a good array of boxing skills and he's a big strong man. And I just think he's all around too good for Usyk," John Fury told Boxing Social.

"Usyk won't be able to hit hard enough to bother him because he's too small. He'll walk straight through. I think AJ will stop him quicker than anybody else. I think AJ will walk straight through him. I do.

"One's a cruiserweight, one's bulking up. And if he bulks up to try and meet him head-on, forget about it. That's why there's weight classes, ain't they. A good biggun will always beat a good littlun. And AJ is a good biggun."

Usyk was in action back in October of last year, when he pulled off a tougher than expected twelve round unanimous decision win over division veteran Derek Chisora.