Gignac travelled to England last week with media reports linking him to a move to Fulham but negotiations broke down and the striker was forced to return to Marseille, where he has struggled to make an impact after joining from Toulouse last season.
"I did not do all it takes to perform well last season," Gignac admitted in a press conference earlier this week.
"I'm back with extra motivation 10 times stronger after my pride was hurt. I am going to get off my bottom and show that I am the striker they [the Marseille officials] expect."
"It is not a sanction," Deschamps said at the time.
Gignac could start Saturday's game against fifth-placed Rennes as Ghana forward Andre Ayew is doubtful after suffering a possible groin injury in an African Nations Cup qualifier against Swaziland last week.
"I feel very well [physically] as I trained with [former club] Fenerbahce during the close season," Lugano, who played 70 minutes with his national team in a friendly against Ukraine last week, told the club's website.
"I think he is a good signing, we can see that he is very skilful with the ball," said midfielder Mathieu Debuchy.
