Dillian Whyte has suggested he put a "beat down" on Dereck Chisora in past sparring sessions and plans to end their feud in destructive fashion.
The new British heavyweight champion will battle Chisora on a packed undercard for Anthony Joshua's IBF heavyweight title defence against Eric Molina on December 10, live on Sky Sports Box Office.
During a long-running feud, Chisora gate-crashed one of Whyte's press conferences, and the London rivals have regularly exchanged insults on Twitter.
Whyte believes the bad blood stems back to their fights behind gym doors, claiming that he regularly got the better of the 32-year-old in sparring.
"I sparred with him years ago and put the beat down on him then when I had no experience, so probably there's been ill feelings since then," Whyte exclusively told Sky Sports.
Referring to rumours about their sparring, he added: "I'm not going to say too much before the fight, but I've been sparring Dereck for a while, I've been holding my own, and beating him up for a few years now.
"But times have changed, things have changed. I think this is last chance saloon for him, so I'm expecting him to come and fight, and for the best Dereck Chisora to show up on December 10 - the best one there has ever been.
"I'm looking to knock Dereck Chisora out."
Chisora continued their war of words by branding Whyte as "predictable" last week, but the Brixton man has laughed off his latest verbal attack.
"I don't think Dereck can spell the word predictable," said Whyte. "Dereck Chisora is the most one-dimensional, predictable fighter in the whole of boxing history. Even a journeyman shows a bit more class and is less predictable."
The British title fight is also an eliminator for the WBC heavyweight belt, which is held by Deontay Wilder, and Whyte is targeting a world title fight in 2017.
"I beat Dereck Chisora then the likes of Deontay Wilder, Luis Ortiz, Anthony Joshua, David Haye - I want to fight the likes of those kind of guys next year," he said.
"It's a WBC world title eliminator, so we'll see. Those are the kind of fights I want."
Watch Dillian Whyte v Dereck Chisora on the undercard of Joshua v Molina, on December 10, live on Sky Sports Box Office.