The Briton and the Ukrainian are set to determine the first outright heavyweight champion since 1999 on May 18 in Riyadh, Saudi Arabia.
"A rematch with Usik? Look, I always take one fight at a time. I could get brain damage and die in the first fight against Alexander, there's no point in looking that far ahead. Or I could get hit by a train, who knows? One fight at a time. But if I'm alive and well and in good shape, then we can fight again," Fury told The Stomping Ground.
Watch this story:
Allen gave a prediction for the fight Usyk - Fury 2