Hafthor Bjornsson has worries over Oleksandr Usyk as he backs Anthony Joshua win

Hafthor Bjornsson has backed Anthony Joshua to beat Oleksandr Usyk as he feels the size difference will be too big a gap for the Ukrainian to overcome.

AJ will lay his WBA (Super), IBF and WBO heavyweight belts on the line when he and Usyk step into the ring at the Tottenham Hotspur Stadium on Saturday evening.

The 2012 Olympic gold medallist has been forced into a mandatory title defence against the former cruiserweight, putting a potential super fight with Tyson Fury on the back burner.

It will be just the third time Usyk, 34, has fought in the increased weight class and he has been bulking up to match up to his opponent.

Despite him registering a career-heaviest 16st 5lb in July, former World's Strongest Man Bjornsson feels the unbeaten boxer will still be at a disadvantage on both weight and height.

He told The Sun: "Absolutely, I will be watching 100 per cent. I think Joshua will be a bit too big for Usyk.

"Usyk is a great boxer, but there is a height difference and a weight difference. I think that Usyk is gaining some weight now.

"So I don't know how that will affect his performance, he won't be used to being that heavy. We don't know how he'll react to that.

Who do you think will come out on top between Usyk and AJ? Let us know in the comments section.

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"Whether it will make him a bit more stiff or what but my money is on Joshua. He's more comfortable in that weight category."

Bjornsson, who has turned to boxing himself, recently underwent a body transformation of his own, though his was to lose weight.

He cut roughly 50kg, around 25% of his body weight, ahead of his fight with arm-wrestler Devon Larratt which was originally meant to be against fellow strongman Eddie Hall.

Joshua, meanwhile, is on a quest to unify all of the major belts, a feat that has not been achieved since the introduction of a fourth major world title.

Fury is the holder of the last remaining belt (WBC) but the 31-year-old must first get through Usyk to get a unification fight back on track.

The Gyspy King, who will be fighting Deontay Wilder in the US next month, has said he will be cheering on Joshua in hopes they can meet next year.

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