Joseph Parker's upcoming heavyweight fight with Dereck Chisora is in doubt, after the Briton stormed out of a press conference in London.
The two title contenders are scheduled to battle at the O2 Arena on October 27 (NZ time) - but not in the card's main bout.
The Matchroom-promoted event is headlined by a world-title contest between super-lightweights Josh Taylor and Regis Prograis.
Playing second fiddle to "little guys" has Chisora fuming - the 35-year-old has ripped promoter Eddie Hearn during a heated press conference, which Parker did not attend.
"Who's the main event of this fight?," Chisora asked Hearn.
The charismatic boxing promoter pointed at Taylor and Prograis, which set Chisora off.
"That's not gonna work for me," he said. "I'm not going to be chief support, that won't work for me.
"I'm not going to sell out O2 for them guys to be the main event.
"These guys wouldn't sell box office by themselves, so f**k that. Either you give me main event or pull me out of the f***ing show.
"I'm being serious, you want me to sell it out to the London crowd - my London fans - then put these little guys that no-one knows about on my show and mug me off.
"I'm taking the main stage - if not, I want more money. You can f**k off, I'll be walking away from this."
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Chisora is also adamant that he should take top billing in the bout with Parker, demanding his name go in front of the Kiwi's and that he follow the former world heavyweight champion to the ring.
Manager David Haye told Sky Sports UK they fight would go ahead as planned and Chisora was probably just "ruffling some feathers".
"Not ideal, but Dereck is Dereck and that's why people pay to see Dereck," Haye said. "He let everybody know how he felt, right or wrong.
"He gets things off his chest, otherwise he explodes. He didn't explode today, so as far as I'm concerned, as his manager, I'm happyish."
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