Tyson Fury and Oleksandr Usyk could meet in an undisputed clash in the Middle East - with Anthony Joshua and Dillian Whyte stepping aside.
Fury had been expected to defend his heavyweight world title against Whyte in March or April - with Joshua facing Usyk for a second time.
But Fury's promoter Bob Arum has claimed they have received an offer from the Middle East to crown a first undisputed champion since Lennox Lewis in 1999.