Speaking to Sky Sport, the former Bayern goalkeeper expressed disbelief at the winger's decision, insisting he has all the natural gifts to be an elite player.
"When you see him, what qualities he has – in training, on the pitch, his speed, his style of football, his dribbling, even his finishing when he's focused: The boy has everything, absolutely everything, you need to become a truly top player," said Kahn
The German stressed that the biggest question around Sane isn’t his ability, but his mentality and desire to consistently reach the very top.
"If he doesn't want that, then it's his decision, then his career will just follow a little differently, and now he has to make sure he finds his place at Galatasaray. If I don't come today, I'll come tomorrow – that's just his character, often with his entire body language."