Toure's performances in Fernandinho's absence were the subject of scrutiny but Pellegrini feels any criticism was unfair.
He said: "Yaya is a very important player for us.
"I have listened to some questions about the way he plays and Yaya plays the way I want him to play.
"He stayed only defending against Norwich because we did not have another defensive midfielder, but I think we lost an important midfielder attacking. He scores a lot of goals and gives a lot of creativity to our team.
"Playing with Javi Garcia or Fernandinho is the way I want him to play, so he is free and can give us a lot of offensive moments.
"But he knows also he has to defend and he can do it without any problems."