The midfielder last played high level football in September 2014 in a League Cup game with his former club Arsenal. Before that, he had only managed 17 minutes since March 2013.
"All the lights are green, I am ready to play," Diaby, who played in a reserve game last Saturday with Marseille, told a news conference on Wednesday ahead of Friday's Ligue 1 game against Stade Rennais.
Diaby, who sustained no less than 42 injuries during his 2006-2015 stint at Arsenal, joined OM as a free agent last summer but has yet to play with the French club's first team.
"I went through a period during which I had to treat a lot of injuries," he explained.
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"It's done, I have never been closer to a comeback. I've had no new injuries (since joining Marseille)."
(Reporting by Julien Pretot, editing by Pritha Sarkar; Editing by XXXX)
