CSKA Moscow 1 Manchester City 2Manchester United 1 Real Sociedad 0Bayer Leverkusen 4 Shakhtar Donetsk 0Real Madrid 2 Juventus 1Galatasaray 3 FC Copenhagen 1Anderlecht 0 Paris St Germain 5Benfica 1 Olympiakos 1Bayern Munich 5 Plzen 0
The City midfielder appeared to be the target of monkey-chanting from a section of the home support during City's 2-1 win in Group D of the competition at the Khimki Arena.
City have confirmed they intend to make a formal complaint to UEFA over the matter.
Manuel Pellegrini: "I didn't know what happened.
"There were some shouts against our player, it is a pity that we still have those stupid things.
"But I hope the right message can be put out for Yaya and Manchester City.
"I cannot answer the question about how Yaya is feeling as I haven't spoken to Yaya, so I cannot say anything about that."
Source: Manchester City MAD