Rico Lewis was the subject of racist abuse by Sevilla fans during the game at City's home stadium.
Two people have been arrested and the club is being investigated.
City said that they would not tolerate discrimination at their stadium.
If the case is proven, Sevilla will take their own actions against the culprits.
Sevilla FC condemns the behavior of two fans in the away section of Manchester City's stadium who were identified and accused of behaving in a racist manner towards Manchester City player Rico Lewis.
If the facts are proved, the two fans will be removed from the list of members.
Sevilla said their fans have always been committed to the fight against racism and that there had never been any racist episodes at their stadium.
Lewis scored the Blues' goal in their win over Sevilla in the group stage.
The goal by Lewis made him the youngest player to score in the group stage of the competition.
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