Borussia Dortmund chief Hans Joachim Watzke fears losing midfielder Ilkay Gundogan.
The German midfielder is highly rated and has been constantly linked with Manchester United and Manchester City.
Watzke told The Sun: “I don’t know if Ilkay will leave this summer. Ilkay is a very important player for us.
“But to be at Borussia is a special thing. We are in the best 10 clubs in Europe and to go to another club is a risk. We want to give him a longer contract.
“We will see what his decision is. But we are very relaxed about this.”