The former AC Milan striker made the controversial switch in August.
"Inter boss Andrea Stramaccioni really wanted me," he said. "What does he like about me? I don't know. I just hope he didn't make the biggest mistake of his life
"Today life is all wine and roses for me. Tomorrow, I don't know. But I have to thank him and President Massimo Moratti who were straight shooters with me - and I'll repay them on the pitch."