Fury-Joshua in jeopardy over Wilder rematch order
Tyson Fury's heavyweight unification fight with Anthony Joshua could be put on hold after an independent arbitrator ruled that the WBC heavyweight champion must face former champion Deontay Wilder in a rematch.
"Until we can reach an accommodation with Deontay Wilder's people, I can't say that (Fury's fight with Joshua) will definitely happen," said Warren.
"But we are working hard to get that over the line.
"We were talking last night and hopefully we can do that.
"If not then Tyson, if he wishes, will go to the fight with Wilder. They're the only two options."
"We can't wait around," Hearn said on his company Matchroom's social media channels.
"We had a deal in place with Tyson Fury and we were told the arbitration wouldn't be an issue, that we could move on with this fight.
"They were wrong and that's on them, that's their responsibility and their problem.
"We hope they can solve that problem, but we have to look after ourselves and Anthony Joshua.
"We have to maintain the position of unified world champion, and those talks will continue and we want to be in a position by the end of this week to know, are we fighting Tyson Fury or are we moving forward with another option."
But after delays caused by the coronavirus pandemic led to last July's contest being postponed, Wilder's team sought to move the bout to 2021.
Fury refused the 2021 date and said he would move on which prompted the mediation.
The two fighters had previously clashed at the Staples Center in Los Angeles in 2018, battling to an epic draw after Fury survived a 12th round knockdown.