Tyson Fury has set a seven-day deadline to arrange a unification fight with Oleksandr Usyk.
Usyk retained his WBA (Super), IBF, WBO and IBO belts after winning his rematch with Anthony Joshua on Saturday.
Fury, who retired after beating Dillian Whyte in April, holds the WBC belt.
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Promoter Frank Warren has said that a bout with Fury is “the only fight” Usyk wants and Fury has given until Sept. 1 for it to be arranged.
If the fight did happen, the winner would become the first undisputed heavyweight champion since Lennox Lewis from 1999 to 2000.