The City ace faces a spell on the sidelines after being injured in victory at Swansea City.
Fernandinho hopes he can recover quickly, saying: "He is a very skilled and intelligent player. When he has the ball, he is so fast and makes decisions so quickly that opponents barely have time to react.
"For me it's special because I'm playing at his side.
"He has decided most of our last games by making goals and assists."