Promoter Eddie Hearn has said they are "running out of time" with negotiations for Anthony Joshua and Tyson Fury to fight in November and conceded he has "no idea" if it will get over the line in time.
While both Joshua and Fury have signed contracts for the fight, talks have been at a near standstill in recent weeks due to a dispute about the location.
Joshua's contract states that the event must take place in the United Kingdom, but Hearn has said Saudi Arabian organisers and broadcaster Netflix want to stage the fight in the United States.
Last month, Hearn sent an addendum to the relevant parties, outlining the things they wanted in return for taking the fight across the Atlantic.
Part of the addendum included a change to Joshua's purse as a result of the increased tax for fighting in America.
Hearn had also insisted that Joshua receive his full payment for the fight against Kristian Prenga in July. He confirmed on Tuesday that "we're all good from the last fight and we're moving forward amicably."
While he told reporters on Tuesday that there had been progress in discissions, nothing has been finalised.
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"There is nothing agreed right now. Will need to make a decision this week.
They have replied. They have our terms," Hearn said.
"We're speaking multiple times a day but we're running out of time if you want to do the fight on Nov. 20.
"They're talking about a press conference next week. It's Tuesday. The ball is in their court."
Asked if all parties involved can get the fight over the line by the end of the week, Hearn said: "I have no idea. I think so.
"But our dream and hope is they turn around and go this is too messy. We'll just do it in Wembley. But they're adamant they want the fight in America."