Vitali Klitschko has taken a swipe at former world heavyweight champion Lennox Lewis after he reneged on a promise of a re-match back in 2003.
Lewis took the WBC title bout seven years ago after a cut forced the Ukrainian to be stopped in the sixth round, although he was ahead on points at the time.
After the clash, the pair met up and it was agreed they would fight again.
Klitschko is preparing for his WBC heavyweight title against London-based Pole Albert Sosnowski on May 29 and believes he knows the reason why Lewis backed out of the fight.
Speaking to reporters, he said: "Lennox promised me but his mum decided he wasn't going to fight.
"He invited me to London, without managers. He said he wanted to talk just together. I came to the room and his mum is there. We talked for two hours and his mum was looking at me and scanning me.
"After that I went away and he called me a couple of hours later and said 'Sorry, but no'. I felt it wasn't his decision, his mum decided. I tried to change his decision, but it's difficult.
"But he was lucky, because I was ahead but the doctor stopped the fight with the cut."