Four Real Madrid players, including Kylian Mbappé and Vinícius Júnior, are being investigated for alleged "indecent conduct" during the Champions League game at Atlético Madrid on March 12, UEFA said on Thursday.
Madrid reached the quarterfinals by beating Atlético 4-2 on penalties at the Metropolitano stadium in the round-of-16 second leg after being 2-2 on aggregate.
UEFA said it has appointed an ethics and disciplinary inspector to study the unspecified allegations in the case, which also involves Antonio Rüdiger and Dani Ceballos.