The 29-year-old joins the Nerazzurri from fellow Serie A side Lazio, signing a four year deal with Roberto Mancini's men as the first signing under the club's new ownership.
Antonio Candreva has signed a four-year deal with Inter, the Serie A club has confirmed.
The Italy international joins from fellow Serie A side Lazio, signing a contract that will keep him at the club until 2020.
The 29-year-old, who spent four years with the capital club, was delighted to complete his move to the Nerazzurri.
"I am really happy and proud to be here," he told the club's official website.