Eddie Hearn, promoter for WBA, WBO, IBF, IBO heavyweight champion Anthony Joshua, says they hope to secure a 2021 unification fight with Tyson Fury.
But the WBO's mandatory challenger, Oleksandr Usyk, plans to push for his mandatory title shot.
This past weekend, Usyk kept his mandatory position in place with a tough twelve round unanimous decision over Derek Chisora at the SSE Arena at Wembley in London.
Joshua has another mandatory challenger to get out of the way, when he faces the IBF's top man, Kubrat Pulev, on December 12.
And Fury is slated to fight on December 5, with a voluntary defense. The current frontrunner is Agit Kabayel.
But if the two champions win, and they can't reach a deal to face each other - then Joshua will satisfy his mandatory obligation to Usyk.
“AJ wants to fight Usyk. It’s all business, money is important to them but Usyk wants a heavyweight world title. If we can’t make the Fury fight and AJ beats Pulev, he is fighting Usyk one million percent," Hearn told The Sun.
Usyk is not planning to go away without a fight - whether Joshua wants to fight Fury or not.
"I am the mandatory for Joshua so he has two options," Usyk told Sky Sports.
"One; to fight me. Two; to vacate and to go and fight Fury. Either he fights me or relinquishes. I am waiting. I am ready."
If Joshua vacates the WBO world title, then Usyk would be forced to fight for the vacant title against unbeaten heavyweight puncher Daniel Dubois - provided he wins his upcoming fight Olympic silver medal winner Joe Joyce.