UEFA has opened disciplinary proceedings against Atletico Madrid due to the behaviour of its fans, charging it with discriminatory behaviour and throwing of objects during its Champions League quarter-final loss at Manchester City, Europe's soccer governing body said on Friday.

UEFA did not elaborate on the offences but said its Control, Ethics and Disciplinary Body (CEDB) will decide on the matter in due course.

Atletico lost the first leg 1-0 at the Etihad Stadium after Kevin De Bruyne scored a second-half winner.

The second leg will be played on Wednesday.