Carragher hung up his boots last week.
He told liverpoolfc.com: "He wasn't someone I played against a lot and he wasn't necessarily the best player I've played against but when I first got in the Liverpool team, [Pierluigi] Casiraghi was a tough one. It was the game where Phil Babb collided with the post.
"I came off after the first half thinking 'Jesus Christ.' Watching the game on TV, you mightn't have noticed it but his movement was a real eye-opener. I didn't know where he was but I was still a young kid learning myself."