And Rolfes admits Leverkusen don't know what the future holds for their prized star.
"We don't know yet what will happen to Kai," Rolfes told Marca. "We know that all the greats from Germany and Europe are after him and that he has the ability to play anywhere.
"He is a fantastic player and, for many years, Bayern has always been behind the young talents of Germany.
"But we have to wait, there are many factors that can have an influence. His future is not yet decided at all.
"I can only say that I love to see him play, especially for as long as possible in the Leverkusen shirt. I have no preferences when it comes to other teams.
"He will be one of the great dominant players of the next 10 years."