David Haye, the manager of heavyweight contender Derek Chisora, believes his boxer will create a tremendous upset when he faces former undisputed cruiserweight champion Oleksandr Usyk.

Chisora will clash with Usyk on May 23rd at the O2 Arena in London.

During the course of his career, Haye was a former unified cruiserweight champion who moved up in weight and became a heavyweight champion.

Usyk is currently the mandatory challenger, under the WBO, to unified world champion Anthony Joshua.

Because of injuries, Usyk has not been very active with a single fight on his ledger since beating Tony Bellew in the fall of 2018.

"One of the best ever cruiserweights moving into a division which he hasn't done anything yet. He touched on it a bit as an amateur. He fought and beat some good big men, but that's in the amateur game when it's long-range, when it's about boxing skills, about jabs, about moving around," Haye told Sky Sports.

"Derek Chisora isn't going to try and outbox Oleksandr Usyk, he's going to drag him into a dogfight from the first second of the round and it's how long can Usyk run? I don't think he's going to run, I think he's brave enough to hold his feet, because I believe he feels he's significantly better than Derek. But what he doesn't realise is - Derek is a completely different animal to what he's ever been in the ring with.

"I don't believe Usyk has been in a rough, tough fight like he's going to be in. He's miscalculated what he believes Derek Chisora is coming to the table with - and we're going to cause a massive, massive upset."