TYSON FURY told Derek Chisora "kiss my a***" after growing sick of his old pal backing his opponents.
The Gypsy King also threatened to "punch him in the face" for his comments.
Fury and Chisora have fought twice, but subsequently developed a friendship over the years.
That bond appears to have fractured beyond repair, however, after Fury blasted the 38-year-old for backing Dillian Whyte in April.
The WBC heavyweight champion told talkSPORT: "I thought Derek did absolutely fantastic [against Kubrat Pulev].
"However, me and Derek Chisora used to be chum buddies. I went to Monaco to support him. I went to Hamburg to support him.
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"Then, as soon as I have a fight he goes, ‘I’ll pick the other guy’. So, Derek Chisora can kiss my a*** and if I see him I’m going to punch him in the face."
Prior to Fury's April knockout of the Body Snatcher, Chisora told talkSPORT: "I’m willing to put my house on it. I’m willing to put my house on Dillian Whyte knocking Tyson Fury out.
"Look at your faces in the studio! Tyson is my mate and I know he’s listening – Tyson, you’re going to get knocked out."
Fury described how Chisora subsequently tried to backtrack – and how he was having none of it.
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He added: "After the fight, he came to the afterparty and said this, that, and the other, made a million excuses. At the end of the day, you don’t do that to your friends.
“If you’re friends with somebody, you back them. You don’t go with the other guy who you don’t like anyway, you go with your friend.
“After what he did, backing Dillian Whyte to knock me out, having his house on it and all that, how confident he was, we ain’t friends anymore. And when I see you, Derek, you’ve got me to fight.”
Fury has fought Chisora twice before, beating him in 2011 and 2014.
And the recently retired heavyweight champ would be happy to do so again, adding: "Derek Chisora if you’re out there and you wanna fight come and see me.
"I’ve busted you two times already and I’ll do it again, you little sucker."
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Chisora was hoping to fight Fury's old foe Deontay Wilder later this year, as he enters the twilight of his career.
But the Bronze Bomber's manager Shelly Finkel swiftly dashed those hopes telling Planet Sport: "Derek Chisora? He just edged a split-decision over Kubrat Pulev, no way."
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