Fury overwhelmed Wilder in their Las Vegas rematch in February, seizing the WBC crown with a seventh-round stoppage.
They had previously fought to a draw in December 2018, and a third bout between the two was set for Las Vegas in July.
But this was postponed due to the COVID-19 pandemic and now looks unlikely to happen before November or December at the earliest.
The British Boxing Board of Control (BBBofC) is hoping to resume professional boxing in Britain in July but with strict conditions and no spectators.
“There’s not going to be big-name fighters out there,” Warren said of the first fights likely after the lockdown.
“There is no chance of Fury versus Wilder behind closed doors.”
Promoter Bob Arum said last month a delay could be even longer because of the importance of gate receipts.
“The fans in the last fight put in almost 17 million dollars (13.8 million pounds) into the coffers in purchase of tickets… How do you replace that 17 million dollars?,” he said. “I mean, you don’t.
“A Fury-Wilder fight might have to wait a couple more months until we can go back to full spectators.”
BBBofC proposals for July, which are still being discussed with promoters, include boxers in Britain having to wear face masks during ring walks.
In addition, they may be banned from using a spit bucket in between rounds.
Former WBA lightweight champion Anthony Crolla said it would be impossible to follow such rules to the letter.
“A boxer can’t spit in a bucket? What if that fighter has a mouthful of blood?,” he asked.
(Reuters/NAN)