Top Rank's CEO Bob Arum, who promotes Tyson Fury in the United States, expects him to face WBC heavyweight champion Deontay Wilder in a rematch.
Wilder and Fury fought to a controversial twelve round split draw in December 2018, at the Staples Center in Los Angeles, California.
The rematch is being targeted for a date in February 2020, at a likely venue in Las Vegas.
But before that happens, both boxers are scheduled to have interim-bouts in the fall.
"The deal is done," Arum said to BBC Sport in Northern Ireland. "But like everything else in boxing it could be an undone deal."
Wilder will have a rematch with Luis Ortiz on a date in October or November. Wilder, who found himself in serious trouble earlier in the bout, stopped Ortiz in the tenth round back in March 2018.
And Fury will face undefeated contender Otto Wallin on September 14th at the T-Mobile Arena in Las Vegas.
Arum's main worry is that one of the boxers will get upset in the coming months, which in turn would crush any plans for a second fight.
"Each of these guys are having an interim fight for whatever reason I can't fathom," Arum said. "Wilder is fighting Ortiz who had him in trouble the last time they fought and Fury is fighting this big Swedish kid in September.
"Hopefully they get by, they win their fights. Then we have a date already and we have two networks that are going to participate in this event. Everything is set but one of these could end up losing."
How a second fight takes place will be interesting, because Fury is aligned with ESPN in America - while Wilder fights under Premier Boxing Champions, who have exclusive deals with rival networks Showtime and Fox Sports.
