Lyon plan to hand down a lifetime ban to one supporter for a Nazi salute that was captured on camera as the club stunned Manchester City in the Champions League.
Wednesday's 2-1 victory over Premier League holders City has now been marred by video footage that spread online following the Group F opener at the Etihad Stadium in Manchester.
Ligue 1 outfit Lyon did not specify the incident in a statement but said they were responding to a "video circulating on social networks".
The club have moved swiftly and are in the process of identifying the supporter.