Frank Warren, co-promoter of WBC heavyweight champion Tyson Fury, fears that it could cost as much as $20 million to get Deontay Wilder to step aside so Fury can fight Anthony Joshua in a full division unification.
Fury vs. Joshua was an inch away from being announced for August 14 in Saudi Arabia.
But on Monday, it was revealed that Deontay Wilder was victorious in his ongoing arbitration with Fury. The arbitrator ruled that Wilder's contractual obligation for a third fight with Fury was valid - ordering the fight to take place by September.
Back in February, Fury stopped Wilder in seven rounds to capture the WBC title at the MGM Grand in Las Vegas.
Wilder would exercise an immediate rematch clause.
Due to the coronavirus pandemic, the fight was pushed back several times - and eventually Fury's handlers deemed the rematch clause to be expired - and then Wilder began the legal action to enforce the rematch.
"It is really simple now Tyson now either goes immediately to the fight with Deontay Wilder or we try to reach and accommodation with Wilder," Warren told BBC radio's Today show.
"To use a phrase in boxing 'step aside' to allow the fight between Anthony Joshua and Tyson Fury fight to take place. I'm sure he'll (Wilder) will want as much as possible but that is going to be about a negotiation if we go down that road.
"It will cost quite a bit of money. Until we reach an accommodation with Wilder's people I can't say the fight will definitely happen. But we are working hard to get that over the line. We were talking last night. If we can't get it done Tyson will go to the fight with Wilder.
"They are the only two options. The arbitrator says that Tyson has a contractual commitment and he has to fulfill that. He is tied up legally. I expect common sense will prevail so we are going to try and make the fight between AJ and Tyson. That is the fight everyone wants to see.
"We are going to do our best to get it over the line. That is what everyone has been working towards for a long time now. There is a cut off point one when a decision has to be made and which direction Tyson goes in. I hope Deontay will accept less than $20 million."
Top Rank's CEO Bob Arum, who also promotes Fury, said a date of July 24 has been set aside in the event Fury-Wilder needs to move forward.