Tyson Fury insists his blockbuster showdown with Anthony Joshua is in doubt because of a feud between rival promoters Eddie Hearn and Dana White.

The standout British heavyweights of their generation have agreed to fight in Cardiff on 11 December and are scheduled to face off at a press conference in London on Wednesday.

But shortly after the contest was announced last week, Hearn, the Matchroom Sport chair, disputed White’s involvement after the American UFC chief and Zuffa Boxing was officially named as a promoter alongside The Ring, which is owned by the Saudi Arabian powerbroker Turki Alalshikh.

Hearn and White have been at loggerheads for months amid a bitter disagreement over where the fight should take place and Fury warned it is now in jeopardy because of Joshua’s long-term promoter.

Fury said: “Breaking news. Anthony Joshua and Eddie Hearn are trying to pull out of this fight. They’re saying they’re not gonna fight now.

“It’s mainly to do with Eddie Hearn’s ego. He’s making up a million different things and threatening ‘we’re not gonna fight, we’re not gonna fight, we’re not gonna fight’. He’s cost us the biggest fight in boxing history. Clown.”

Hearn has yet to respond to Fury’s comments.

This story will update