And he says the England No1 will keep his place for the clash with Liverpool this week.
Pellegrini said: "We don't know what will happen in the future, today, what Joe did I think he did it well.
"We'll see what will happen, every match we can play with different 11 starters, but at the moment Joe will continue to play in the next game.
"At the moment he deserved to play today and he also deserves to continue.
"When I put (Costel) Pantilimon in the starting XI I spoke with Joe and he understood that he was not in a good moment.
"Maybe seven games after, one month after, he's working very hard, and I thought that he deserved another opportunity, and I think he did it well.
"It was a tough decision (to change the goalkeeper) because we were winning. I think Pantilimon was doing well also but I thought that this game was better for Joe to play.
"I think that we have a squad, and I have to make the decision every week who will play, not only Joe Hart."
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