Marseille coach Didier Deschamps admits it will be "very difficult" to keep the French striker.
Ben Arfa declared his Marseille career over and he would "never play for the club again".
Deschamps: "I never said I did not want him. But it is very difficult given his radical position and his attitude.
"I think I did a lot for him. He has talent, but still some weaknesses. I wish him the best for his career.
"I have spent a lot of time talking to Hatem, and told him many things.
"Some of it he has remembered, some of it not.
"Last Thursday he refused to speak to me, so it may be for the best."