Bayer Leverkusen director Rudi Voller thinks Kai Havertz will join the 'world-class club'.

Havertz, 20, has been linked with Bayern Munich, Liverpool and Manchester United after his performance in Bundesliga this season.

But Voller hopes he can hold onto the Germany international for a bit longer.

"I'm honest, I always have such a small hope that we can and will keep him here for another year," Germany legend Voller told Sky Sports on Wednesday.

"It doesn't change the fact that he's already a world-class player anyway, that's what he was before. Now the attention is even more on him.

"He will switch to an absolute world-class club at some point."