Borussia Dortmund chief exec Hans-Joachim Watzke admits they risk losing young striker Youssoufa Moukoko.

The teen is off contract in June and is a target for Chelsea, Liverpool and Barcelona.

Watzke told Sky Deutschland: "It is legitimate that you try to get a good position for yourself.

"But it is equally legitimate to have our ideas. And if they do not coincide (with the player) the collaboration cannot continue.

"Obviously we hope he stays, but I don't think he will sign the renewal just out of gratitude to the club. Gratitude is not currency in professional football."