Steve Collins has already started training for his proposed fight with Roy Jones Jnr and plans to silence his old rival with a knockout.
The 48-year-old Irishman retired from boxing in 1997, but he has agreed to return against ring legend Jones and the pair are awaiting offers to stage the bout.
Former trainer Freddie Roach has advised Collins about his preparations and he will be trained in Dublin by his brother Paschal, who works with middleweight Gary O'Sullivan.
"I'm back in training a week now," he told Ringside podcast Toe 2 Toe. "My brother Paschal is going to be my coach. He's got the gym, the knowledge and the expertise.
"We were both over in LA with Freddie, had a good chat about the whole thing."
When asked about his physical condition, Collins added: "I feel like I've never been away. This is a fight that I've always wanted. I've never thought about coming back, I absolutely had no interest in coming back.
"I don't need financially to come back, but this fight is different. It's unfinished business."
Collins defeated Chris Eubank and Nigel Benn during his three-year reign as WBO super-middleweight champion and is confident he will send 44-year-old Jones into retirement with a crushing defeat.
"It's something that should have happened 15 year ago," he said. "Roy's talking about retiring. He talking about being inducted into the Hall of Fame and so on, but people always ask him: 'why did he not fight Steve Collins?'
"I've accused him of running and he said he never ran. He's said he will fight me now and my reply to that is if Roy Jones believes and thinks I've gone soft in my old age, he's made a big mistake.
"I said I'll knock him out now, like I'd have knocked him out 15 years ago.
"We're waiting for the best deal to come in that suits us both and we're going to go with it."