Tyson Fury will take on Deontay Wilder six days before Christmas.
The heavyweight rivals were due to fight for a third time this month but the fight was delayed by the coronavirus crisis.
The rescheduled date of October 3 also fell by the wayside and the pair are now expected to meet on December 19 with Las Vegas in the running to host the bout.
Promoters Top Rank also hope fans will be able to attend, with boxing across the world currently operating behind closed doors.
Executive Brad Jacobs told Sky Sports: "We are focusing on December 19 and are hoping that, by then, we are back to a nearly normal situation.
"That may be a 50 per cent capacity.
"We are looking all over the world, at this point, for the best location for this event. That will be narrowed down and we'll see where it takes us.
"There are many offers from all over the world. It will land where it lands, for whatever reason. At the moment there is no real progress for any specific location.
"We are looking towards what the next step is," Jacobs said. "A small hall with 1,000 people? A big arena that holds 15,000 but with 3,000 inside? How close can people sit? It is a huge undertaking to reach this next step. We are investigating it actively."
As well as Sin City, Macau, Australia and New Zealand are also in the running to host a fight which stands in the way of an undisputed fight between Fury and Anthony Joshua.
Fury stopped Wilder in the seventh round of their rematch in February, 15 months after he twice climbed off the canvas in the rivals' first meeting only to be denied victory by the judges.
