The 47-year-old will replace caretaker manager Jean-Luc Ruty at the helm of the Ligue 1 strugglers who have been without a permanent coach since sacking Frederic Hantz on December 12.
Gillot, who will start work on January 2, resigned as boss of Lens in May and will have his work cut out if he is to keep Sochaux in the top flight.
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