Heavyweight champion Vladimir Klitshcko's next bout will be against British contender David Haye in London, the Ukrainian said.
"We are still conducting negotiations but the fight is expected to be held on June 20," Klitschko told a news conference, naming Chelsea's Stamford Bridge stadium as the likely venue.
He dismissed as bravado Haye's suggestions that he would win.
"Haye can say whatever he wants," Klitschko said. "I have the experience of knocking out guys who promised to turn my birthday into a funeral. His behaviour is inappropriate... I will give my reply in the ring. He's in for a rough ride."
Klitschko's older brother Vitaly said his next fight was scheduled for March 21 in Stuttgart against Cuban Juan Carlos Gomes.