In February 2008, Wladimir beat Russia's Sultan Ibragimov to take the WBO crown - and his last fight was a seventh-round stoppage of former world champion Hasim Rahman in December.

BBC: Haye 'an embarrassment to boxing'

"I thought I could land some punches earlier but it wasn't worth it because Hasim Rahman knew he was up against the best and he was really focused, you could see that, " said Klitschko.

BBC: Clinical Klitschko stops Rahman

Haye, whose Hayemaker Promotions has signed a deal to stage his next four fights at London's O2 Arena and who wants to fight former undisputed heavyweight king Hasim Rahman in the autumn, also accused Warren of being "obsessed" with him.

BBC: Haye pours scorn on Skelton offer