Chelsea have pledged to take the “strongest possible action” after a video circulated on social media of a spectator launching alleged sectarian abuse towards Aston Villa’s John McGinn.

The Blues have launched an investigation into abuse appearing to be directed at Scotland midfielder McGinn during Chelsea’s 3-0 Premier League win at Stamford Bridge on Saturday.

Romelu Lukaku scored twice and Mateo Kovacic was also on target, but the focus on events has now taken a darker turn.

Chelsea have appealed for help in identifying the alleged culprit from Saturday’s west London match.

“We are aware of a video circulating on social media showing an individual using abusive language of a sectarian nature in the crowd at Stamford Bridge on Saturday,” read a Chelsea statement.

“Chelsea football club finds all forms of discriminatory behaviour totally unacceptable and we condemn the language used.

“The club is working to identify the person involved and will take the strongest possible action against them.

“Any supporter who was present in that area of the ground and has information that can assist the club’s investigation should contact the club via our discrimination reporting line, 0207 3863355.”