Eddie Hearn, promoter of heavyweight contender Anthony Joshua, has no idea why Tyson Fury would consider making a defense of the WBC world title against Manuel Charr.

Hearn is currently in serious negotiations with Fury's handlers to finalize a defense against Joshua - with December 3 in Cardiff being targeted.

But, Fury is angered with the delay in finalizing the terms - and has openly threatened to instead fight Charr in a voluntary defense.

Hearn views a contest between Fury and Charr as an absolute mismatch. Fury is widely regarded as the top heavyweight fighter in the world.

If the discussions for Fury vs. Joshua fall apart - Hearn would rather see Fury fight someone like unbeaten dangerman Joe Joyce.

Both Fury and Joyce are promoted by Frank Warren's Queensberry Promotions, which makes the negotiations a lot easier.

Joyce is coming off a tremendous win. Last month in Manchester, he scored an eleventh round knockout of former WBO world champion Joseph Parker.

Hearn is shocked with Fury's persistence to call out Charr.

"I've just opened up Instagram and saw he's called out Manuel Charr again," Hearn told Off Script on Dubai Eye.

"He's calling him out like this is a guy who is an actual credible heavyweight. 'You're the one Manuel, you've got the guts.' This is a guy who's not even rated. It's a chronic mismatch and if he doesn't want to fight AJ, why doesn't he fight Joe Joyce? He's ready to go and they have the same promotional company."

Joshua is looking to bounce back after suffering back to back decision losses to unified heavyweight beltholder Oleksandr Usyk.

Joyce, through the WBO, is a mandatory challenger to Usyk.