Diaby was cut loose at the end of last season by Olympique Marseille.
The Frenchman has plans to find a new club in January, telling BeinSport: "The idea is to find a club in the winter mercato. I have three good months to be able to prepare well, to integrate into a club and to play later.
"I take this as a fight, the struggle of my life. I always had goals, I wanted to know how far I could go. It is true that after there were my problems of injury but everything calls me to be patient and to fight to find a solution favorable to my problem."