The England No.1 was not at his best on Sunday, beaten twice from corners as his side fell to a 3-2 defeat against newly promoted Cardiff City, though he retained his place to face Hull City Tigers on Saturday.
|MANCHESTER CITY LATEST
|7/4||Man City are 7/4 with BetVictor to win the Premier League
"I said from the beginning my teams never play with names, they play with performance. Joe knows he needs good performances in the next games.
"We know Joe has a difficult moment but players need trust in those moments. At the moment he has all the trust."
Pellegrini believes that the Three Lions keeper can continue to improve with the help of goalkeeping coach Xabi Mancisidor, however.
"Joe is a young goalkeeper," he continued. "He reached the top in England here maybe too young and he needs a lot of things to improve. Xabi will do it."