FRANCEErstwhile central defender, who played for Angers, Beauvais, Rouen and Boulogne during his playing days, Sébastien Tambouret began his career as a coach in 2010. He would primarily coach the youth teams at the academies of Sedan, Auxerre, Metz and Olympique Marseille. He joined Stade Rennais in the Summer of 2023 to coach Rennes' U19s, and was promoted to take over the Reserve team in National 3 (French fifth tier) for the 2024/2025 season. After the First Team boss, Julien Stéphan, was sacked by the club on 7th November 2024, Tambouret was called up to take over the professional squad as interim manager, and would make his first-ever appearance on the bench in Ligue 1 for the home fixture against Toulouse on matchday 11 of the season.
On 9th February 2026, just fourteen months after his first experience, Tambouret was called upon once again to take over as caretaker manager of the Stade Rennais First Team, this time following the sacking of Habib Beye, and his backroom staff, after the club had suffered four successive heavy defeats in league and cup.