Mike Tyson believes David Haye should establish himself in the heavyweight division before taking on the Klitschkos.
Tyson, one of the most feared heavyweights in history, told Sky Sports that current WBA champion Haye needs more experience before attempting to unify the titles.
"He's good, he's a good fighter," said the 45-year-old. "He has to establish himself as a champion.
"Believe it or not, he has to beat the likes of Chris Arreola, he has to beat all these guys.
"He doesn't have to beat the Klitschko guys, he's got to beat the up and coming guys like Arreola and the Russian guys.
"He has to establish himself and then fight the Klitschkos."
Tyson insisted he had no future in the fight game, scotching recent rumours that he might return to the ring to fight Evander Holyfield for a third time.
"I don't have anything in the future that I want - I just want to raise my kids and pay my bills," he added.
"Why would I want to be a manager or promoter? They only steal your money, at least that's my experience, and why would I want to do that?
"I'm not interested in getting back in the ring, not at all. I'm pretty much a pacifist as much as anything now.
"As long my kids respect me and call me 'Dad' and not by my first name, I'm happy."