Promoter Eddie Hearn predicts Derek Chisora will do everything possible to win the upcoming fight with former undisputed cruiserweight world champion Oleksandr Usyk.

The fight was officially announced for May 23 at The O2 in London.

Usyk returns back to UK, after traveling there in 2018 to score a brutal knockout over Chisora's close friend, Tony Bellew.

Hearn is actually surprised that Usyk accepted such a dangerous fight with Chisora.

Due to injuries, Usyk has only had a single fight since beating Bellew in the fall of 2018. He wasn't overly impressive in his heavyweight debut to defeat heavyweight veteran Chazz Witherspoon last year.

And Usyk is risking his mandatory title shot, under the WBO, at current world champion Anthony Joshua.

"There will be significant disadvantages for Usyk in the heavyweight division but what he loses in size and power he makes up for with speed and skill," Hearn told Sky Sports.

"That's the equaliser. Does the footwork and skill of Usyk beat the heart, willpower, strength and power of Chisora? Does it beat the power of Chisora at The O2, an arena where he has rolled the clock back so many times? Chisora is difficult to beat at The O2 so I'm surprised Usyk took this fight. He is mandatory but willing to put it on the line.

"Style-wise, Usyk isn't at the top of anyone's list but, with him transitioning to the heavyweight division, people fancy their chances a lot more. I would have preferred Tony Bellew to fight Usyk [at heavyweight] but he wanted to try and become undisputed cruiserweight champion.

Chisora is not overly happy and [his manager] David Haye has done a good job of keeping him on the leash, because he was ready to go in February then March," Hearn said. Usyk had issues with his elbows before he got into camp. Haye had to send Chisora away to be patient. This is a massive opportunity for Chisora. He will beg, borrow and steal to win that fight against Usyk. This is a dangerous fight when you've got someone fired up and tough like Chisora."