David Haye says that Wladimir Klitschko has been passed fit for their heavyweight title unification bout.
There had been speculation that the Ukrainian's brother Vitali would step in after Wladimir pulled out of a 30 April bout with Dereck Chisora because of a stomach injury.
But Haye told BBC Radio 5 live: "I know it's Wladimir I am fighting, he is fit to fight and ready to go."
WBA champion Haye will face IBF and WBO holder Klitschko on 25 June or 2 July.
The Londoner added that the fight is likely to take place in Germany - where the Klitschkos are based - with stadiums in Dortmund, Gelsenkirchen and Kaiserslautern under consideration.
"It doesn't bother me," Haye said. "I haven't been pressing them for a venue, as long as I know I am fighting at the end of June or start of July I am happy.
"I have heard people talking about crazy places all over the world, but I'm anticipating the fight to be in Germany."
Vitali Klitschko recently defended his WBC heavyweight title against Cuba's Odlanier Solis.
Haye turns 31 this October and has previously said he plans to retire at that age as the undisputed heavyweight champion of the world, having beaten both Klitschkos.