Yaya Toure says David Silva is key to success at Manchester City.

Toure insists they will hold their nerve and stay in the hunt for the Premier League title.

"I've suffered watching the games on the TV and it's my natural instinct to help my team-mates," he said. "The defeats have been painful because I wanted to win three titles but I don't think it's because of my absence. I'm not indispensable.

"David Silva is the best player in the Premier League. Without doubt, he separates us from United and Chelsea. It's a pleasure to play with him because he's so impressive. Aguero is also a great player and it feels we are connected.

"I left Barcelona to improve as a player and I believe that I have fulfilled my challenge and I am very happy."