David Haye has said he has agreed a bout to fight Vitali Klitschko in London in June next year for the Ukrainian's world heavyweight title.
'This is going to be the biggest fight since Lennox (Lewis) and (Mike) Tyson, no doubt about it,' Haye, who has had just one bout as a heavyweight, told BBC Radio Five Live.
'I have said from day one I am going to be the undisputed cruiserweight and heavyweight champion. I have not disappointed.'
The 28-year-old Londoner added: 'I am not cherry-picking, I am going after the most dangerous fighter on the planet.'
Klitschko, 37, who was defeated by former world heavyweight champion Lewis in 2005, regained the World Boxing Council (WBC) belt he vacated three years ago, after seemingly retiring himself, by defeating Samuel Peter in October.
Haye, a cruiserweight world champion, marked his first heavyweight bout after stepping up a division with a fifth-round stoppage of the experienced Monte Barrett in London last month, flooring the American five times in total.
Wladimir Klitschko, Vitali's brother, is the holder of both the International Boxing Federation (IBF) and World Boxing Organisation (WBO) heavyweight titles, which he kept in Mannheim in Germany on Saturday with a seventh-round technical knock-out of the United States's Hasim Rahman.
Haye, who was ringside for that fight, said afterwards: 'I want to fight the best in this division and it doesn't bother me which of you (Klitschkos) it is.'
He told the BBC on Sunday: 'I was out in Germany to watch Wladimir Klitschko bore everybody to sleep with his jab.
'We sat down with K2 Promotions and thrashed out a deal in the early hours of this (Sunday) morning.
'We agreed terms for myself and Vitali at a London venue to be decided. The fight is going to happen in June.
'It's all done and dusted, just need to dot the i's and cross the t's.
'We sat down and talked numbers and that made sense for both sides and it's done. There is no boxing politics involved. Plain and simple, this is how boxing should be.'
The Klitschko brothers have vowed never to fight one another and, such is the lack of viable contenders in the heavyweight division, Haye's plan to box for a version of a title in the near future despite his lack of experience in the class is not as outlandish as it would have once seemed.
Haye's professional record stands at 22 wins with 21 knockouts and one defeat, when he was stopped four years ago in the fifth round by veteran British cruiserweight Carl Thompson, who fought back from a barrage of blows.
Haye, whose defeat of Barrett was watched live by Vitali Klitschko, said after his victory over the American: 'You can see Vitali wants to fight. He feels a lot bigger than me.
'I can figure out a strategy to beat him. I'm definitely faster than him, and I'd like to prove to everybody just how fast.'
Vitali Klitschko, speaking after the Barrett bout, said: 'The heavyweight division is heading for crisis.
'It needs strong good fighters. I was very impressed - it's not so easy to go up from cruiserweight. David Haye is brilliant.'
