The midfielder has joined on-loan from Inter Milan.
“I'm happy, of course," he told Sky Sport Italia.
“I tried to do my talking on the pitch. Now [Inter] must know the mistake they made.
“I don't feel hunted. I'm peaceful and calm. I'm going back to Sardinia to do well.
“I made a decision with my heart, I had so many offers: now I want to lift the team in my centenary year."