Every major belt in the division is held by the undefeated duo of Fury and Usyk.
Last weekend, Fury knocked out Deontay Wilder in the 11th round of their bout, while Usyk saw off Joshua by unanimous decision.
“He shouldn’t be going through with it,” Warren told Sky Sports about Joshua.
“It’s his choice. If he knocks it on the head, it opens the door for us to do the unification [Fury vs Usyk].
“Let AJ get a warm-up fight. He needs a winning mentality before he goes into [a rematch with Usyk].
“Maybe he fights the winner [of Fury vs Usyk] which is still a big fight.”
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