Updated

UEFA President Michel Platini has ordered an investigation after a Champions League referee failed to follow guidelines and stop a match to warn Russian fans about racist abuse.

UEFA said on Friday its protocol for match officials to handle racism incidents "was not applied" during the CSKA Moscow-Manchester City match on Wednesday.

The organization asks referees to "stop the match and ask for a public address system announcement to be made" when racist chants or displays occur.

Platini's request puts 33-year-old Romanian referee Ovidiu Hategan under scrutiny as well as the Russian club. UEFA has opened a disciplinary case against CSKA, prompted by complaints by Man City and midfielder Yaya Toure, who is black.