The postponed heavyweight rematch between Britain's David Haye and Tony Bellew will take place on Saturday, May 5, at London's O2 Arena.
The pair were scheduled to meet on December 17, but Haye suffered a "freak" training accident and had to have surgery on a torn bicep.
WBC cruiserweight world champion Bellew, 34, stopped former heavyweight world champion Haye, 37, in March.
Haye injured an Achilles in the sixth round and was stopped in the 11th.
Bellew has admitted his absence from the ring, enforced by the postponement of his rematch against David Haye, is “unheard of”.
Bellew will aim to beat Haye again on May 5, live on Sky Sports Box Office, 14 months after their first fight. Haye had delayed a scheduled rematch on December 17 while he recuperates from a bicep injury.
"I like to fight three or four times a year but since I became world champion, on the magical ride that I've had, it has shortened my activity," Bellew told Sky Sports News.
"This is unheard of, though. Fourteen months. This isn't down to me, it's down to David Haye.
"Injuries do happen but when you have torn as many muscles as David has, you have to ask questions.
"David, be ready, because this is holding up my career. I wish him well in a speedy recovery."
However, promoter Eddie Hearn says Haye must force his way into contention to challenge Anthony Joshua because he "isn't on our radar".
Haye had mentioned a desire to "challenge for the No 1 spot" against Joshua but that opportunity depends on the outcome of his rematch with Bellew.
"I am more confident than ever that Bellew wins, but if Haye were to win, then his popularity and the size of a fight [against Joshua] would mean it could be one to consider," Hearn told Sky Sports.
"If he beats Bellew he could make some noise about [fighting Joshua].
"One of his big motivations is to fight Joshua but he isn't on our radar, at the moment."
Haye says: "I am a guy who can challenge for that No 1 spot. Anything other than a conclusive, spectacular victory, is a failure in my eyes. If I win the fight, but I struggle, I'm honest enough with myself to know the likes of Anthony Joshua, the No 1 in the division... if I cannot beat Tony Bellew in emphatic style, then I've got no business mentioning his name."