Hart pulled off several top class saves to earn City a controversial win.
"I'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.
"He's worked very hard for a month-and-a-half and now he's back to his best because he's the best goalkeeper in England."
For breaking stories and all the great banter like us on Facebook: facebook.com/tribalfootball