(CNN) -- David Haye has set his sights on a fight with Vitali Klitschko after defeating Russian giant Nikolai Valuev to win the WBA heavyweight championship.
The British fighter pulled out of a scheduled fight with Vitali's brother Wladimir, the IBF and WBO champion, this summer after suffering a back injury.
Former cruiserweight world champion Haye had baited the Klitschkos for months, notoriously wearing a T-shirt depicting him holding the severed heads of the brothers.
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Now Haye has hinted at a future meeting with Vitali, while the Ukrainian WBC champion claimed he would fight him "at any time and knock him down."
"I said I want to be unified champion and the Klitschkos are definitely in my sights," said Cyprus-based Haye.
"Unfortunately the fight (against one of the brothers) didn't happen. But if it had, I wouldn't have been fighting Valuev now and I would have been locked down on that crazy contract they tried to get me to sign."
Klitschko has previously been hesitant over a fight with Haye, but he has appeared to have changed his mind with the Englishman winning a world title.
"Full congratulations (to Haye). It was a good performance, a good points win. It was very close," Vitali said on Sunday.
"It is a good fight for the future, maybe. I am ready to fight anyone in the world. I am ready to show to everyone I am the strongest in the world."
Both have mandatory opponents to contend with first. Haye must make his first defense against former world champion John Ruiz, while Klitschko meets American Kevin Johnson on December 12.