In a recent interview with Sky Sports, former four time heavyweight champion Evander Holyfield issued another challenger to the Klitschko brothers - advising them to take the opportunity to "probably make the biggest payday of their lives" by fighting him. Holyfield, 49, has no interest in hanging up the gloves just yet, instead calling out the two biggest names in the division. Wladimir has the WBO/IBO/WBA/IBF titles, while older brother Vitali has the WBC crown.

"Age ain't nothing but a number," Holyfield told Sky Sports. "They (the Klitschkos) have got an opportunity to probably make the biggest payday of their lives fighting Evander Holyfield. They are telling everyone that they respect me, and that they don't want to beat me up.

"But I fought George Foreman, I fought Larry Holmes, and I said the same thing. I said that I wouldn't get any credibility from beating someone older. They said 'but, we are going to get you 20 million, what do you think?'. I said make sure that guy wants to fight me, because I don't want it to look like I fought that older guy, but that he fought me. With the Klitschkos, they aren't choosing to fight me, I've said I'll fight them. All they got to do is realize that both of us will make money, then we'll see who the winner is."