Tyson Fury is set to fight Oleksandr Usyk in an undisputed heavyweight showdown in Saudi Arabia.
Promoter Frank Warren said on Friday afternoon that a deal for the blockbuster bout has finally been agreed.
However, the date of the contest, which will take place in Riyadh, has not been announced.
“Delighted to finally get this fight signed,” said Queensbury promoter Warren. “This is the biggest fight that could possibly be made in our sport.
“The heavyweights always spark the imagination of the fans, and I have no doubt this will be the biggest boxing event of the century.”
Fury, 35, is due to fight in Riyadh against former UFC world heavyweight champion Francis Ngannou on October 28. His WBC belt will not be on the line.
He recently told TNT Sports: "The fans want it and if the money's there we'll do it. Why on in the world would I want to fight [Usyk] for no money, he's got zero personality, he's an ugly b******d with gappy teeth and he's half the size of me, so it's all to gain for him and nothing to gain for me, isn't it?
"If I beat him it's 'oh well he beat a middleweight', if he beats me then he beat the legendary Tyson Fury and it's for no money. And it's not just that, he was offered the fight in Wembley in April and he didn't take it, he ran away, looking for more money.
"I understand that everyone wants the most money possible, I do. This is prizefighting, we all want the biggest bag, and as much as people say it's about the belts, it's about my record or my legacy, no. It's about getting paid and getting laid."
Last month, Usyk, 36 maintained his unbeaten record with a knockout victory over Daniel Dubois in Poland.
The Ukrainian put down Londoner Dubois in the ninth round to retain his WBA, IBF and WBO heavyweight belts.
The winner of the bout between Fury and Usyk will see the first undisputed heavyweight champion of the four-belt era.
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