Faty, who has just regained his first-team place, suffered an ankle injury following an over-the-top tackle by Gragnic in a training session on Thursday.
There was no hiding the anger of Gerets, who is already without injured centre-backs Gael Givet and Julien Rodriguez for this weekend, and he said: "Jacques is the prototype of a true professional, and this is such a shame for him. Really, I am not happy with what has happened."
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