LEWIS V KLITSCHKO The first fight was stopped on a technical knock-out in the sixth round Profile: Lennox Lewis

World heavyweight champion Lennox Lewis says his proposed fight against Vitali Klitschko is likely to be his last.

Lewis beat Klitschko after gaining a sixth-round technical knock-out in Los Angeles last month.

Negotiations for the rematch are already under way and the fight could take place on 6 December.

Asked if he would retire should the bout go ahead, Lewis told BBC Sport: "Yeah I think so.

I'm going to make a wise decision in the near future Lennox Lewis

"I would have nothing left to prove. Even now I have nothing left to prove. I'm just basically boxing for the fun of it."

But Lewis insists he will wait until the negotiations with Klitschko are concluded before making a final decision on his future.

"Other people are hyped up about the Klitschko fight and obviously they want to see another one," Lewis said.

"I enjoyed the first one. Right now we are just working out the logistics and talking to his manager and [pay-TV company] HBO to see what we can work out.

"I definitely want to see what can be worked out before I really make that decision on what I'm going to do in my near future, whether I'm going to retire or keep going.

"I'm not going to be in the sport that long, I'm definitely getting old in terms of this sport, but I'm going to make a wise decision in the near future."

HAVE YOUR SAY Lewis should fight Roy Jones before he retires From Benjy Join the debate

Despite the uncertainty surrounding his future, Lewis dismissed suggestions that he may have lost his motivation.

"If a man thinks he can beat me I'm out to prove him wrong," said the Briton.

"Klitschko's 6ft 8in, so I will definitely have to train hard.

"We'll have to see what happens. I have nothing to prove. I've already proven that I can beat Klitschko on my worst day.

"He can never be better than he was, he cuts very easily. So I don't see the fight being that difficult."