“We needed a strong performance after the Super Cup, although we weren't consistent throughout the 90 minutes.
“Today the lads defended well after the penalty, because we did not defend properly before then and allowed Cagliari a few chances," Allegri told Mediaset Premium.
It was only 1-0 when Alex Sandro tripped Duje Cop and it was spotted by the Video Assistant Referee, but Buffon saved the Diego Farias spot-kick.
“I waited for the referee to make a decision, he gave the penalty, but fortunately Buffon is always a Number 1 and he got us out of a difficult situation.
“The lads interpreted the match well overall and I am happy."