Tyson Fury claimed Anthony Joshua does not want to fight him as he unleashed a barrage of abuse on his fellow Brit.
Negotiations are ongoing over a mouthwatering world heavyweight title bout between WBC champion Fury and Joshua on December 3.
Eddie Hearn, Joshua's promoter, stated this week that an initial contract offer sent by Fury's camp was not acceptable, but the parties are "working positively" to try and reach an agreement.
Fury on Friday made it clear he does not believe two-time world champion Joshua has any intention of stepping into the ring with him.
He stated in a video posted on social media: "He's had the contract for I don’t know how long and ain’t signing it. You little sausage, you do not want a fight.
"However, I will be fighting on December 3, if this sausage does not sign this contract, which I don't think he is because I don't think he’s got the b******s to."
The unbeaten Fury also took aim at WBA, IBF and WBO champion Oleksandr Usyk, who stated his intention to "outbox" the Englishman if they meet in a unification fight.
Fury added: "Usyk, you little s***house, I'm afraid of you? I'll put my fist right through the side of you, you little sausage.
"Joshua is a s***house, Usyk a s***house. You are all s***houses."