Hart pulled off several top class saves to earn City a controversial win.
"Iâ€™m very pleased with Joe, not only today but all the games in the last month," said Pellegrini afterwards.
"I thought it was good for him to have a rest because he had played all the games for three years and he was not in his best moment.
"Heâ€™s worked very hard for a month-and-a-half and now heâ€™s back to his best because heâ€™s the best goalkeeper in England."
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