Borussia Dortmund chief Michael Zorc has warned fans to expect to lose more stars this summer.
"It is very difficult to counteract this, because we do not have any illusions. We will also have to let players go again and again in the future. Our job is to compensate for this as much as possible," he told BILD.
"This development is a curse of success for us somewhere. We're always losing players to other clubs that are even bigger than us, have even more appeal and an even better wallet."