Atletico Madrid defender Stefan Savic appeared to pull Jack Grealish's hair during the Champions League quarter-final with Manchester City
City qualified for the last four after a goalless quarter-final second leg.
Atletico defender Felipe's sending-off after a foul on Phil Foden sparked a confrontation involving both sets of players and coaching staff.
The disciplinary committee of governing body Uefa has not punished Atletico.
During the incident former City defender Stefan Savic appeared to pull Jack Grealish's hair before confronting the England forward after the game.
Atletico had been ordered to close part of their stadium prior to City's visit before successfully appealing against Uefa's decision.
Man City and Atletico Madrid players clashed after Felipe's red card
Uefa had ordered Atletico to close at least 5,000 seats at the Wanda Metropolitano in response to "discriminatory behaviour" by Atletico fans during the first leg in Manchester.
That punishment was overturned after a request to the Court of Arbitration for Sport.
-- Courtesy of BBC Sport