Perin saved the AC Milan striker's spotkick for their draw at the San Siro on Saturday.
"I had studied Balotelli's penalty technique, though of course in these situations you also need a lot of luck," 21-year-old Perin told Mediaset Premium.
"I was going to my right, but then I saw he was watching me during the run-up, so the moment he looked down at the ball I changed direction at the last second.
"My experience last season at Pescara was very useful. I used to collapse at the first mistake, but I don't this year. I keep my head up and know I can still be decisive."
For breaking stories and all the great banter like us on Facebook: facebook.com/tribalfootball