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Toulouse was the final club where William Vainqueur played professionally. He joined the French club in 2019 after a successful career that included stints at AS Roma, Dynamo Moscow, and Marseille. Vainqueur played a key role in Toulouse's midfield during his two seasons with the club, helping them avoid relegation from Ligue 1. He retired from professional football in 2021 at the age of 33.