Frank Warren has issued Oleksandr Usyk with a warning of his behaviour when he fights Tyson Fury.
Fury is the WBC champion and he was set to meet the Ukrainian to contest his title and the remaining three belts held by Usyk.
However the February 17 date was scrapped when Fury suffered a cut in training, and the fight will now take place on May 18 (live on DAZN.com).
"Cuts and blood always look bad wherein a couple of weeks they can look much different," Fury’s promoter Warren told Sky Sports.
"If he's confident, I'm confident. He's not going to set himself a date that's going to fall apart.
"We've got governing bodies pressurising because they want to see the belts being fought for so it's a matter of it has to happen on that date.
"I'm quite confident it will do."
He added: "He's had bad cuts before. He feels that it will be healed up in the next couple of months and that will give him six weeks preparation.
"Contrary again to all the ridiculous rumours he was in magnificent shape. You've only got to look at some of the photos of him to see.
"He's now got another date to aim for and that's where he's at. I think the general mood of the camp is they can build on all the good work they've done. It's not unusual in boxing.
"There are stacks of fights over the years that have been delayed."
He suggested Usyk is overly demanding of referees, explaining: "He has previous for complaining and moaning when he gets caught to the body.
"Now he's in there with a guy who is the master of taking advantage of any weakness.
"He does it a lot Usyk, he 'crybabies' to the ref. He's had previous for it about body shots. As long as the referee's strong in that I'm really happy and I'm even more confident in Tyson in this fight than I was prior to [Usyk] fighting Daniel Dubois," Warren said.
"I believe in Tyson. I've believed in him since day one.
"I genuinely think that he's the best heavyweight out there."
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