Izzo, 27, was a star in the centre of defence for the Turin club, notching up 37 appearances.
Despite declaring his contentment at Torino, Izzo admitted earlier this week that he was happy being courted by clubs.
He told Gazzetta dello Sport: "For now I'm happy. Everyone likes to be courted.
"I have four years left on my contract at Torino, and I want to show my worth: I don't like just being called a good player. I'm worth more."
"Among Italian defenders, other than [Giorgio] Chiellini, I don't see others stronger or more determined than I am. I'm honoured to wear Torino's shirt and I will spill blood until the last day I wear it."