Bob Arum has revealed Tyson Fury could be in line to face Deontay Wilder amid concerns over an all-British blockbuster against Anthony Joshua collapsing.
Fans are expecting confirmation about the heavyweight showdown, which would see all four major world titles on the line.
Promoter Eddie Hearn has previously said the fight will take place towards the end of July or early August with Saudi Arabia the front-runner to host.
However, Arum appeared less confident of the fight getting made and told Dan Rafael that a trilogy bout with Wilder could be next instead.
"Maybe we'll breathe some life into Wilder, and Fury will fight Wilder and Joshua will fight (WBO mandatory challenger Oleksandr) Usyk," said Arum to BoxingScene.com.
"Eddie Hearn is busy trying to sell the London Bridge," Arum continued.
"Let me tell you - last time I talked to Eddie was early last week and he said he was going to have a signed agreement from the Saudis in 24 hours.
"Well, he's a little late. Wouldn't you be pessimistic if you haven't heard from him or anybody for a week?
"We're the promoter with Frank [Warren] of Fury and we haven't heard from Eddie in a week."
Fury has been inactive since his dominant rematch win over the Bronze Bomber in February of last year.
Hearn reassured fans about the fight by insisting Fury wanted the fight and that it was 'on the verge' of being announced.
According to co-promoter Frank Warren, it could not be further from the truth with the Gypsy King fed up of 'hanging around'.
Contracts have been sent to respective parties but it was not binding.
"We got a document and they said it wasn't binding. We said it has to be binding and we haven't heard back from them.
"It says in (the paperwork) it this is not a binding agreement," Arum continued.
"Eddie sent me the draft but it was not a binding agreement and it was supposed to be turned into a binding agreement in 24 hours and Frank and I haven't spoken to Eddie since. He's gone radio silent."