The 25-year-old shot-stopper's performance in the Champions League group game against the German champions was praised by the striker on Twitter and his Italian manager
Billed before the game as a "must-win" encounter by manager Roberto Mancini, the side managed to walk away with a point after a last-gasp penalty from Mario Balotelli levelled the scores, but Rooney believes there was only one reason why the game wasn't out of sight by that point, with Hart on top form throughout.
"Have to say Joe Hart has been incredible. For me best keeper in the world," Rooney tweeted.
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"Joe Hart saved us from an incredible defeat," Mancini told reporters.
"He saved everything, so I should say thank you to him.
"He gave a fantastic performance. I don't know if it is the best performance in football history, but he did very well."
Manchester City currently sit third in the group now on just the one point from their opening two games, behind both Real Madrid on six and Borussia Dortmund on four, but they now face Dutch outfit Ajax in their next two fixtures.