The France international has been linked with a return to the Premiership, where Newcastle, Bolton and Birmingham City would welcome him back.
"Djibril Cisse is not always a starter and is experiencing that in a very unpleasant way," he told But. "I understand him.
"He has never been a problem here and has not publicly declared he wanted to leave, but we can understand that if his situation continues he will consider a move.
"When he makes a decision that will force him away from Marseille, I will be the first one to know it.
"We will take a decision at that moment."