Martin Caceres and David Trezeguet struck for Juve to maintain their 100 per cent record so far this season.
Ferrara said: “I was impressed by [Sebastian] Giovinco, [David] Trezeguet who hadn't played yet and Tiago when he came off the bench. We reacted well to that first half.
“I particularly want to single out [Martin] Caceres, who was effectively making his debut and we thank him for scoring a great goal to give us the lead.”
Trezeguet made his first start of the season and scored a late goal, perhaps changing his decision to leave next summer.
“The goal was very important for him and also the fact he played for 90 minutes with a good level of fitness, being able to come back and help his teammates.
“Obviously a goal is everything for a striker's confidence and he worked so hard that he deserved this chance.”
Ferrara added: “Clearly there is a lot of responsibility and I was worried that we weren't the usual Juventus tonight, but I relaxed in the second half when I saw that we managed to win back the ball more often and were more reactive.”