The Olympique Lyon midfielder came off the bench to give Les Bleus their second goal in a 2-0 win against Romania at the Stade de France in his first international since he being sent off against hosts South Africa at the World Cup.
"This lad is among those who were more damaged than others by the World Cup," coach Laurent Blanc, who made Gourcuff Girondins Bordeaux's undisputable playmaker when he was at the Ligue 1 side, told reporters on Sunday.
"He is rebuilding himself."
Gourcuff's delicate turns and skill could prove lethal against a Luxembourg side that are expected to sit back and play for a draw.
"He is on his way back (to top form)," said Blanc, who hinted Gourcuff could start at Metz's St Symphorien stadium.
"It is very likely that several players who were not playing (against Romania) will start (on Tuesday)."
Diaby's pace would be a strong weapon as France will probably need to pierce through a double defensive shield against Luxembourg.
"He is a strong candidate for Tuesday," said Blanc, who explained he was extremely satisfied with his squad's behaviour.
"I have a squad of players who are all able to play. It's quite an exhilarating feeling for a coach."
