Robinho had opened the scoring at San Siro before Lionel Messi's response in the Champions League Group H tie.
"We dropped two points and deserved to win this game against Milan," the Coach told Sky Sport Italia.
"We created more scoring opportunities and that is why we would've deserved the victory. We made a mistake leaving the initiative to the Rossoneri when Milan scored their goal. We paid for that error.
"Messi played well, as did the rest of the team. He was in the thick of the action."
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