Juve won via goals from Arthur and Weston McKennie.
"It was important to bring intensity to the game, which we above all did in the first half and could've killed the game, but if you don't finish it off, then the match will always be in the balance," Pirlo told DAZ.
“Bologna attacked us very high, we did well to make the most of the spaces they left us."
Alvaro Morata was subbed on in the second half.
“We decided to deploy another striker, we had many more spaces and we knew a player like Morata would have helped us.
“It's normal, we'd like to always dominate the games, today we had 20 shots on target and we should have killed off the game earlier.
“Giorgio's [Chiellini] return was important, he hadn't played four games in a row for long time, Szczesny is a great goalkeeper and is always ready."