Mata is a big fan of the Ivorian.
He told The Sun: "Yaya is one of the best midfielders in the world.
"He is the complete player. He can defend, attack, score, dribble, he has great skills and he's so tall and powerful.
"It is so difficult to defend against him. We have very good midfielders too and will try to deal with him but not just him... all their team because City are a very, very good side."