The 35-year-old played for the Rossoneri in 2006.
“Christian is coming out the other side of the injury tunnel,” sporting director Carlo Osti insisted on Sky Sport Italia.
“This is the crucial phase as he will be back training with the rest of the group next week and it’s just up to him to do everything he can.
“Hopefully he should be back at the Coach’s disposal for the game against Milan.”
