"What is certain is that he will not be there for the Nice game (on Wednesday). For Sochaux (on Saturday), it will be difficult and after that, we will have to wait and see", Blanc told reporters.
"The medical staff will let us know."
Gourcuff, France's first-choice playmaker for the World Cup, picked up the injury on April 24 in a 1-0 Ligue 1 defeat at Lorient.
"I will not take any risk," he said.
"But if he is fit, it means he is able to be in the (Bordeaux) squad, to play a game, to start a game.
"But today he only had a little jogging session so we're not there yet."
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