Gladbach chief Max Eberl has confirmed Thorgan Hazard has asked to leave the club this summer.
The news will bring shockwaves for a number of clubs interested in the Belgium international, who is the younger brother of Chelsea star Eden Hazard.
And Eberl has named Borussia Dortmund, Atletico Madrid and Liverpool as potential landing spots for the former Chelsea winger.
"Thorgan has informed us that he doesn't want to extend his contract and that he wants to leave the club in the summer to take the next step," Eberl told Sky Germany.
"I've heard this statement 15 times in the last 10 years as really great players have left us. That's the way it is for us.
"We'll have to see where his path will continue. I don't know whether it will be at BVB, who are constantly being mentioned, or at Atletico Madrid, Liverpool or another club."