Mutu's departure will surprise Chelsea fans and appears to have been engineered by the player himself. After Mutu's difficult first season in England, head coach Mourinho declared he was impressed with the player's attitude when he returned for pre- season training last month, but the former Inter Milan striker has been unsettled by the recent arrivals of Drogba and Kezman.
Personal reasons may also have contributed to his decision as he is attempting a reconciliation with his ex-wife Alexandra, a Milan-based actress.
Although Mourinho admires Mutu's ability he only wants players who are 100 per cent committed to the club and did not try to stand in his way.
Mourinho said last week: "The door of our dressing room is closed for people coming in but to leave the door is always open.
"If a player wants to leave and is not happy with Chelsea, the club, the atmosphere, the conditions, the smell, the colour of the shirt, he can go."
Mutu will become the third high-profile star to return to Italy on loan this summer after Hernan Crespo and Juan Veron joined AC Milan and Inter Milan respectively.
Chelsea are still paying almost 50 per cent of Crespo's salary and may have to continue contributing towards Mutu's £60,000-a-week wages, an extraordinary indication of their indifference to usual business practices.