LONDON (AP) — Liverpool says Mamadou Sakho is being investigated by UEFA over a potential breach of anti-doping rules.

The Europa League semifinalists say the France defender has not been suspended but that "the club in consultation with the player has decided that while this process is followed the player will not be available for selection for matches."

Liverpool says that on Friday "a formal communication was received from UEFA stating that they are investigating a possible anti-doping rule violation."

A person familiar with the situation told The Associated Press that the drugs test happened after Liverpool's Europa League game at Manchester United on March 17 and that a fat-burning substance was detected. The person spoke on condition of anonymity because the investigation is ongoing.

(Story by: Rob Harris, Global Soccer Writer, The Associated Press)