Manchester City boss Manuel Pellegrini is delighted with the impact of Willy Caballero.

Pellegrini says the Argentine has forced Joe Hart to take his game to a new level.

"I'm very happy with the different things," he said. "Having important restrictions about money and the number of players it was important to try to have an alternative in defence.

"Joe Hart has improved because he has a more competitive player behind him like Willy Caballero."