Talks are under way over a historic bout for the undisputed heavyweight championship of the world between Anthony Joshua and Tyson Fury.
Representatives of the two fighters are in dialogue with venues keen to stage the fight in a bid to make clear how much money the contest could generate.
Neither side is negotiating monetary splits or wider demands at this stage.
But Joshua's promoter Eddie Hearn said they are "talking" about how a bout for all the heavyweight belts could happen.
One source close to the discussions told BBC Sport they now believe the fight "will happen" and confirmed talks were under way.
Authorities in Saudi Arabia - the country that staged Joshua's rematch victory over Andy Ruiz Jr in December - are keen to secure the bout.
