Liverpool and Chelsea are watching Youssoufa Moukoko's situation at Borussia Dortmund.
The Germany striker penned a new deal with BVB over the summer to 2026.
But Moukoko has yet to start a game this season, and has one goal in five appearances.
BILD says Moukoko's struggles have alerted major clubs across Europe.
Real Madrid, Liverpool, Chelsea, Juventus and Barcelona are all interested in the 18-year-old.
Dortmund are said to be open to selling the striker, seeking 30-40m to part with the youngster in January.