"I'm here to give my all, to help my teammates," he told Inter's official website. "It's an honour to join Inter.
"I'm very proud to be part of this great squad of players, many of whom I already know. I've already heard from Javier Zanetti and Rodrigo Palacio who congratulated me. It's a very special moment for me."
Carrizo played 25 times in Serie A in five years at Lazio.