"It's a shame because we had managed to wrestle a game back in our favour that had started badly due to an individual error, which is something that can happen, then to concede an immediate equaliser is unusual," he told the club's official website. "But that's football for you.
"Changing something to catch the opposition by surprise is something that can be done during a game. But we've only got [Simone] Pepe in the squad who would enable us to adopt a 4-3-3 system. Based on the players available, you look to go for the formation that can get the best out of them."
Juventus are second in the group, four points behind their next opponents Real Madrid.