Manchester City boss Manuel Pellegrini believes Joe Hart still has plenty of improving to do.

The England goalkeeper produced a string of fine saves in City's 4-2 win at Swansea City on Sunday, including a stunning reaction block to deny Federico Fernandez's header in the 82nd minute.

After the triumph, Pellegrini spoke of Hart's ability and implored the 28-year old to strive hard to become one of the top few keepers in the world.

"It was a beautiful save in a very important moment," Pellegrini said.

"Joe is the number one goalkeeper in England and I think he has improved a lot this season.

"Bringing Willy Caballero was good for him, giving him good competition and also working with the goalkeeping coach Xabier Mancisidor.

"It's important for him but he most important thing is he has an open mind.

"He is only 28 years old and the must improve in a lot of things, but he is working hard to do it.

"It is difficult for a young goalkeeper to be so good at the start of his career and it is difficult to compare him with all the other goalkeepers here.

"There are three or four good goalkeepers in this league, but Joe must improve and not think he knows everything at this moment. Every day he works hard."