The midfielder is currently sidelined with a leg strain.
But Galliani insists: "It was an idea to sign him when (Kevin-Prince) Boateng left, we believe that the Brazilian will serve our cause.
"The physical tests were positive, he has always been in our hearts.
"He's not what he was a few years ago, but physically is similar to ten years ago. I'm not afraid. He will not do poorly in this new experience with the Rossoneri."