The experienced midfielder has reunited with former Partenopei boss Carlo Ancelotti at Goodison Park
The 29-year-old said at his unveiling on Saturday: “It is a real pleasure to sign for Everton. I am immensely happy to be here.
“I hope, like I have done in my entire career, I contribute with my performances together with my teammates and that I put in some great games, great performances and win important things.
“It is a club with a rich history in the Premier League, has real ambition and then there is Professor Ancelotti.
“He has done everything possible to bring me here.
“It is the size of the Club and the name of the coach which means you don’t think twice about coming to Everton.”
More to follow.