A heavyweight unification bout between Tyson Fury and Oleksandr Usyk "will be made", says promoter Frank Warren, who also did not discount the possibility of an all-British bout between Fury and Anthony Joshua.

Usyk retained his WBA, WBO and IBF titles, and also claimed the Ring Magazine belt with a split-decision victory over Joshua on Saturday to take his record to 20 professional bouts undefeated.

WBC champion Fury appeared to reaffirm his retiremenet ahead of the fight, but subsequently suggested promoters and fans "get [their] cheque book out" after the Ukrainian's win.

Warren, who handles Fury's bouts, has suggested the pair could square off next - and finally deliver the division's first undsputed champion since 1999.

"He and Usyk would be a really good fight," Warren told BBC Radio 5 Live. "It's a fight that I think will be made because both teams would like to see that happen."

Britain's Lennox Lewis beat Evander Holyfield to become the last undisputed heavyweight champion over two decades ago, but there has not been a bout with all four belts on the line since the WBO title was included in 2007.

"Usyk said after the fight that it's the only fight he's interested in, and it's certainly the same case with Tyson," Warren added.

"It's just a matter of where it will generate the most income because it's a unique fight, a historic fight.

"It's the first time for God knows how long that the four belts are on the line. Both fighters are undefeated. The whole world of boxing will be captivated by this fight."

Warren has also not ruled out seeing the long-awaited clash between Fury and Joshua, though the likelihood of such a fight following the latter's third defeat in his past five fights seems questionable.

Joshua first lost the WBA, WBO and IBF titles to Andy Ruiz Jr, though despite winning them back in the rematch, subsequently lost them to Usyk again last year.

The prospect of an all-British unification bout between Joshua and Fury was floated at multiple points during their reigns but ultimately never materialised, and Warren said Joshua will have to win some more fights before he can be considered a contender for Fury.

"If AJ manages to get a couple of wins under his belt - and I believe Tyson will beat Usyk - that may be a fight to be made," Warren added. "But AJ's got to re-establish himself before you can even think about fights like that."