Manchester City boss Roberto Mancini is demanding more from matchwinner Samir Nasri.

Nasri struck late on in victory over Chelsea.

But Mancini is a hard taskmaster. And he believes Nasri can do much more.

"Samir did well but he can do better," said Mancini. "He can improve. He is a top player. If he plays like this he can be like David Silva or Xavi if he plays."