Atletico Madrid was charged by UEFA on Friday after a fan was filmed apparently making Nazi salutes at a Champions League game.
The club was charged with "discriminatory behaviour" and for fans throwing objects during Atletico's 1-0 loss at Manchester City on Tuesday.
UEFA disciplinary rules hold clubs responsible for fan misconduct inside stadiums. No timetable was given for a verdict.
Atletico hosts the second leg of the quarterfinals on Wednesday.