Massimiliano Allegri has urged his side Juventus, to improve after they knocked out 10-man Porto.

Paulo Dybala’s first-half penalty and a red card for Maxi Pereira were enough to end the visitors’ hopes of overturning a 2-0 deficit from the first leg against a Juventus team who have only conceded three goals in a single game once in their home stadium.

“The aim was to arrive at least in the last eight,” he told Mediaset. “Now we will see what will happen to us.

“We have to improve the quality of the game, given that we will face important teams. We made a good first half, and the guys were smart not to force it. But then we defended badly, threatening to concede a goal.”

“It was necessary to do one of two things: to attack, or to defend and save energy,” added Allegri, whose side face Sampdoria in Serie A on Sunday.

“We were very good in the first half, but not in the second.”