Tony Bellew is determined to prove the doubters wrong and put an end to Oleksandr Usyk's unbeaten record.
The Liverpudlian, whose last two fights ended in wins over David Haye at heavyweight, seems set to take on WBA, WBC and WBO cruiserweight champion Usyk later this year.
November is being widely reported as the likely month for the bout, and Bellew will start as underdog against a man who is 15-0 in his professional career with 11 knockouts.
Yet Bellew, a former holder of the WBC cruiserweight title, is full of belief that he can cause an upset in what could be his final fight before hanging up his gloves.
"When we get down to it, I'll be in the ring with a phenomenal boxer, a man who has brought the amateur style that won him Olympic gold into the professional arena," Bellew wrote in his BBC Sport column.
"But make no mistake, I will not stand in awe or admire him from afar. I will push him to the absolute limits and let's see what he's got. Let's see what he's like when it's really hard.
"I've been down, got off the floor, overcome major cuts in fights, been behind on the cards, I've experienced everything in this game and I don't believe he has.
"I've not heard one reporter say they think I can beat him yet but I've been written off forever.
"This bout is one I could sign off on. If I lose, which I could, then so be it. But I know I am going to beat him. I don't know how, I just know I'm going to get to him.
"Of course, I'll watch Usyk and, let's be honest, he will see far more flaws in me than I do him.
"But I have that one-punch power that he doesn't. I can iron this fella out with one punch. It takes one movement, one mistake, sucking him in for one second and I will put him out."