(CNN) -- World Boxing Association (WBA) heavyweight champion David Haye has confirmed that a unification bout with Ukrainian Wladimir Klitschko will finally happen later this year after months of contract negotiations.
Klitschko was due to defend his World Boxing Organization (WBO) and International Boxing Federation (IBF) titles against Haye's fellow-Briton Dereck Chisora on April 30.
However, the younger of the Klitschko brothers has now pulled out of that fight, opening the way for him to face Haye on either June 25 or July 2 in Germany.
Confirming the news on his official website, Haye said: "I always believed we'd one day fight and I'm glad we've cut through the nonsense and put together the most important fight in the heavyweight division.
"This is the match the boxing world has been calling for since I first decided to step into the heavyweight division and I feel it is my destiny to fight and beat Wladimir Klitschko."
Haye added: "We are the best two heavyweights in the world and it would have been a travesty for us to have never fought.
"This is an inevitable fight with an inevitable conclusion. Wladimir Klitschko is getting violently knocked out."
Klitschko, 34, is a two-time WBO champion having defended that belt nine times, and of his 55 wins, 49 have come inside the distance.
Haye continued: "I have been chasing this fight since day one, because I know boxing styles and I know which styles I have success against.
"Klitschko is ready-made for me. I eat tall, chinny Eastern European heavyweights for breakfast.
Wladimir is a fighter that doesn't like to fight, and he has admitted that fact in the past. Unfortunately for him, I am a fighter that loves nothing more than fighting," Haye added.
"I have the heart of lion, whereas Wladimir has the heart of a hyena. He cries and squeals and slips into the wilderness at the first sign of any danger.
"Wladimir has proven this over the years, and I'm certain he will want no part of this lion when it finally comes time to go to war."
The winner of the fight will hold three of the four recognised heavyweight titles, with Wladimir's older brother Vitali in possession of the World Boxing Council (WBC) version of the belt.