Juve had 70 per cent possession at Old Trafford in the first half, but eventually only scored the Paulo Dybala effort and ran one risk late on with Paul Pogba's strike off the upright.
Allegri said, "Against Genoa we stopped a bit too early and were rightly punished. This evening we allowed a few chances when losing the ball cheaply and we should've been faster at moving the ball around, but when the players were static, the ball was too.
“Nonetheless, it was a good team performance and we deserved the victory," Allegri told Sky Sport Italia.
“We won a lot of balls in the air, Alex Sandro played it simple and did very well in defence. We controlled the tempo in the first half and had chances to score more goals, getting the final or penultimate pass wrong, but the build-up was largely correct."
“We still make too many mistakes on the final ball, as we had so many more chances and half-chances that we didn't develop properly. A couple of times it was the player with the ball, another couple it was the player who didn't peel away from his marker to reach the space."