Bayer Leverkusen chief Rudi Voller concedes young midfielder Kai Havertz is generating huge transfer interest.

Sport1 has reported Bayer expect to sell Havertz, 20, for about €100m, next summer.

The youngster is being chased by Bayern Munich, Barcelona, Real Madrid, Manchester City, Chelsea, Manchester United, Liverpool and Arsenal.

And Voller revealed: "It's no secret that there were a couple of phone calls and a great deal of interest. I then spoke directly and completely friendly with Karl-Heinz Rummenigge (Bavarian CEO). (He) completely understood that we didn't (wanted to sell).

"Bavaria was not the only club that asked us about Kai Havertz."