The former Parma striker missed last season due to a heart complaint.
After signing on a four-year deal for Inter as a free agent, the Frenchman was quickly asked when he would be fit to play.
“I'm not sure," he responded, in his introductory press conference. “You can't put a date on it. It depends on how my body responds.
"I've come back to prove myself all over again after a year on the sidelines. I want to show what I can do.
“I'm going to give it my best shot here, vying with great players. I'm ready for a new experience.
"I'm not afraid - I wouldn't have been able to come back if I were. I'm here because I don't have any fear."