Manchester City boss Roberto Mancini has stated that Joe Hart "needs to improve" if he is to become one of the best goalkeepers in the world.

Hart kept another clean sheet in his side's 1-0 win over Aston Villa on Sunday afternoon, but Mancini has refused to admit that the 24-year-old is now one of the best in the world.

"In the world I don't think because he (Hart) is young and there are other keepers with more experience. I think he is one of the best, but he needs to improve because he is young. He has many years in front of him, but he could become one of the top keepers," Mancini told Sky Sports News.

Hart joined City from Shrewsbury Town in 2006.