Paulo Dybala and Weston McKennie struck the goals for Juve.
But Allegri later snapped: “We held out mentally and technically for 120 minutes on Wednesday, but there was a moment tonight when we just left the game.
“That's not right, we always have to be fully focused, especially when there aren't enough fans to keep us on our toes, because for 10 minutes we ran some big risks."
Dybala failed to celebrate his goal, instead glaring at the directors' box.
Allegri shrugged: “There was nobody in the stands, who was he looking at?! He was imagining the stands were full. It was a very good goal, a quick passing move with Kean, then when he gets between the lines and moves the ball, that helps the team to breathe. He was extraordinary in those situations."
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