The 26-year-old winger has been in France to discuss joining the Ligue 1 outfit and although he passed his medical, personal terms have not been reached.
Boukari, whose only season with Wolves was severely disrupted by a troublesome calf injury, has now returned to the Black Country in a bid to improve his fitness with the club still hopeful of offloading him.
"Razak passed the medical which was fine," boss Kenny Jackett told the club's official website.
"He didn't agree terms but it is still under negotiation and the talks are ongoing.
"In terms of him, he is fit now and ready to train and he will need a constructive week.
"The first team are doing fitness work and he needs football so will train with the Under-18s and then the Under-21s.
"I don't think he will be in the group this week that prepares for Crawley (on Friday).
"He is a Wolves player and he builds up his fitness after missing pre-season."