But Haye, who plans to retire before his 31st birthday in October, had to pull out with a back injury.
Talks to rearrange the fight stalled last December with the two camps wrangling over the details of the contest.
Now that the fight has finally been agreed, Klitschko says he is looking forward to taking on the Brit.
"David Haye thinks that Vitali is the toughest one," he added. "That's why he's taking on the younger brother - because he's not that tough. That's why he chose me.
"You know what? I'm so scared of David Haye. He says he's going to take out my jab; so, I will really feed him with the jab - jab jab grab, jab jab grab, grab, and eventually the right missile is going to land on his chin or his temple or whatever it is.
"So I'm sorry guys, but David Haye will get knocked out."
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