Danny Williams has launched a scathing attack on Audley Harrison ahead of their all-British heavyweight clash at London's ExCel Centre on Saturday.
"Audley Harrison is technically very good but doesn't have much heart and is a celebrity boxer," Williams said.
"Once I put the pressure on he will start to wilt," he told BBC Sport.
Williams, who claimed that Harrison "punches like a little girl" added: "I want this fight more and that's going to be the major factor."
Harrison's attitude outside the ring was also questioned by Williams who said: "He's more interested in the after-show parties, the money and getting his name in the newspapers, he doesn't want to put in the work."
The 33-year-old Williams has been putting in some impressive training work in preparation for the eagerly-awaited contest.
His methods have included pushing his family in a car down derelict roads, which, as he explains, has its problems: "Everyone thinks I'm trying to jump start it," he said.
"But it is great, it works the lungs and every part of the body."
Former heavyweight champion Lennox Lewis believes Harrison, also 33 and undefeated in 19 professional fights, will prove too strong for Williams.
"It's going to be a great fight, both have a lot of heart," said Lewis, who beat Frank Bruno in an all-British heavyweight clash in 1993.
"Danny throws punches from all angles but I think Audley's size may be too much for him," he told BBC Sport.
"In my view Audley has more strength and more talent."
Lewis rejected theories that Harrison has taken the wrong route to the top following his Olympic success in Sydney over five years ago.
"He's doing it right, he needs to stay in shape, improve that jab and improve those skills."
Williams dismissed suggestions from Lewis that he struggles with taller fighters, notably Vitali Klitschko, who beat him in eight rounds in December 2004.
"I had problems with Klitschko but that's because he's a world class fighter and he hits hard.
"Audley Harrison hits like a little girl and I can take his punches, get inside and let my shots through."
Lewis revealed that he receives an average of one offer a month to make a return to the ring, but he is unlikely to be persuaded.
"I've accomplished my goals and it's time for the younger guys to try to accomplish what I have for the last 17 years," he said.
"I don't want to be 45, training and worrying about injuries. There are new stars on the horizon and Audley is one of them."