Television pictures appeared to show the target of abuse was Chelsea defender Antonio Ruediger, who is black. The Germany international joined Chelsea from Roma in the offseason after two seasons in Italy.
UEFA's disciplinary panel will judge the case on Nov. 16. In cases of racist abuse, UEFA has ordered a section of a club's stadium to be closed for a Champions League game. Repeated offenses have seen games ordered to be played in an empty stadium.
Chelsea visits Rome for the return match on Oct. 31. The incident happened during a UEFA campaign with discrimination monitoring group Fare to promote diversity and tolerance at games.