"We put together two positive performances and we needed to keep two clean sheets in a row," the 44-year-old told Sky Sport Italia.
"We conceded 10 goals, which was unusual because defence has always been our strength. We had to shake off the two defeats to Fiorentina and Real Madrid.
"This was a good result and we definitely need to improve, even if it's not easy playing every three days."
Juve travel to the Stadio Ennio Tardini on Saturday to take on Parma.