Bayer Leverkusen sports chief Rudi Voller has no doubts about the quality of Kai Havertz.
A target for Europe's biggest clubs, Voller insists Bayer will fight hard to hold onto the attacking midfielder.
Barcelona, Liverpool and Manchester City are all keen on Havertz as Voller says: "Over the past few months, you could see with Kai Havertz how motivated he is, how much he is committed to this team.
"He will be the best German player of the next ten years and nothing will change. We are glad that we have him.
"Now and maybe also in the next season..."