Britain's former world heavyweight boxing champion David Haye quit the sport after handing in his fight license.
Haye turns 31 on Thursday and always insisted that he would not continue past his birthday.
"I received an email on Monday advising me Haye would not be carrying on," British Boxing Board of Control secretary Robert Smith said. "The board will discuss it on Wednesday, but there is no way we could go against his wish not to renew his boxing license. Without it, he can't fight."
Haye already stepped down as a boxing promoter, with super-middleweight George Groves switching to fellow Briton Frank Warren.
The Hayemaker's last fight in July ended in bitter disappointment when he lost his World Boxing Association crown to Ukraine's Wladimir Klitschko.
Critics laid into the Londoner for a timid display, but it later emerged that he needed painkilling injections before the bout for a broken toe and could not move properly.
Haye's plan was to beat Wladimir and fight his big brother, Vitali, to unite the heavyweight division. But unless there is a major shift in his attitude, that will never happen.
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