WBC heavyweight champion Tyson Fury has demanded Derek Chisora sign the contract for their trilogy fight.

As BoixngScene.com previously reported, Chisora's management revealed that they were approached with an offer to have a trilogy fight with Fury - which reportedly would take place before the end of the year.

Fury was in action back in April, when he knocked out mandatory challenger Dillian Whyte in six rounds.

Last month, Chisora won a tough twelve round decision in his rematch with world title challenger Kubrat Pulev.

Chisora suffered his first career defeat to Fury in 2011, with the big man outboxing him over twelve rounds. They had a rematch in 2014, with Fury battering and stopping Chisora in ten rounds.

Over the years, Fury and Chisora became good friends - but recently the two boxers had a bad falling out. 

Their animosity stems from Chisora openly backing Whyte to beat Fury in their mandatory fight. Chisora said he was willing to stake his "house" on the outcome.

In a recent interview, Chisora's promoter, Eddie Hearn of Matchroom, said the offer from Fury was too low.

Fury disagrees.

On Monday, he took to social media to post a video to verbally blast Chisora for his delay in signing the contract.

"This one goes out to Derek 'The sh!thouse' Chisora; you're running Derek, from the trilogy," Fury said. "You call yourself 'War' but you should call yourself chicken because you're running from the trilogy and from a career-high payday. Get that f------ contract signed."

A few days ago, Fury's co-promoter, Frank Warren, explained that his boxer was getting that itch to fight again. Fury had previously vowed to retire in the aftermath of his knockout of Whyte.

"He’s got itchy feet at the moment, he wants to fight," Warren told talkSPORT. "I think what’s going to happen is, see what happens on [August] 20th [between Anthony Joshua and Oleksandr Usyk] and the outcome of that and that’ll determine what he intends to do in the future. My opinion, this is not from him, it’s from me. I think he will [return] because he’s a fighting man and he misses it. That’s what he does, he wants to fight."