Daniel Dubois and Oleksandr Usyk are in talks to fight at Wembley Stadium on 12th July.
The rival heavyweight champions hold all four major world titles between them, with Dubois the IBF champion and Usyk the WBA (Super), WBO and WBC belt holder.
Usyk, 38, is undefeated in 23 fights and has a win over Dubois, stopping him in August 2023.
Their rematch would be for the undisputed heavyweight title as well as give Dubois the chance to revenge.
Dubois has won three fights since his defeat by Usyk, securing a knockout in each of them.
If Dubois cannot reach terms with Usyk, he will be ordered by the IBF to face veteran Derek Chisora who the IBF has as its number one mandatory challenger.
Dubois was expected to defend his IBF belt against Joseph Parker in February, before illness caused him to withdraw from the contest in the week of the fight.
Usyk’s most recent fight was his second win over Fury, when he confirmed himself as the number one heavyweight in the world.
No British fighter has held the undisputed heavyweight title in the four-belt era and the last Briton to be undisputed heavyweight champion was Lennox Lewis in 1999.