Tony Bellew claims he will be fuelled by the doubters when he fights undisputed cruiserweight champion Oleksandr Usyk in Manchester on November 10.
In what may prove to be the final fight of his career, Bellew, 35, will move back down to cruiserweight to face the IBF, WBA, WBC and WBO champion Usyk.
The Ukrainian boasts a 15-0 record and Bellew will again be considered the underdog, as he was against fellow Briton David Haye, whom he defeated in each of his previous two bouts.
"The world's going to write me off; the more you write me off, the more I want to fight," Bellew told a press conference.
"We will see. I'm going up against a monster, the man who no one really wants to fight, the man who just dismantles fighters and beats them easily.
"And make no mistake, he's looking past me already. He's already asking [promoter] Eddie [Hearn], 'Who am I going to fight at heavyweight?'
"He says he believes I am arrogant. It is not arrogance that he sees. For the first time in his whole career he sees a man looking back at him who believes he can win, and not a man who believes that he's just going to lose.
"As great as the other fighters are that he's faced and beaten, not one of them goes in there with the heart and the belief that they're going to beat him.
"I don't just think or believe, I know I'm going to find a way. I always do."
Bellew claimed it was watching Usyk beat Murat Gassiev on his honeymoon that convinced him he needed to step into the ring with him.
Usyk, who has knocked out 11 opponents, is not expecting the challenger to roll over.
"He is the man who takes the biggest challenges and he's not the kind of usual boxer who comes, sees how hard it is and they just quit," the Ukrainian said.
"He will come to the end. These kind of fights are something the world wants to see."
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