The Blaugrana dominated the first 45 minutes, but struggled far more after the break when Mario Balotelli came off the bench.
"It was a game of two halves and two faces," the Coach told Mediaset.
"It was one Barça in the first half and another in the second. It was a difficult game, as Gerard Pique's mistake weighed heavily on us and allowed Milan the chance to get back into the match."
Leo Messi converted a penalty and scored a well-worked second, ending his four-game drought.
"I was never worried about Messi, because he'd already been through phases like this. It was wonderful to see him convert all that expectation into goals tonight.
"We knew he would've resolved the match for us again."
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