Manchester City boss Roberto Mancini admits losing Yaya and Kolo Toure after the weekend is a concern.

With Yaya playing his last game for the Blues against Manchester United on Sunday before leaving for the Africa Cup of Nations, Mancini paid tribute to his midfield powerhouse who scored one and made another in an impressive display.

"I have tried to find another Yaya in my squad, but there isn't another Yaya," the City boss told the club's website.

"He will play against United on Sunday and then he will join the Ivory Coast.

"January is a big month for us and I think if we can come out on the top of the Premier League, I think we will have a very good chance to win (the title).

"But without Yaya and Kolo for several weeks, it will be hard."