Mendy began his career with Marseille, and played for one season with their B team in Championnat de France Amateur 2.
He spent three seasons in Championnat National with Fréjus Saint-Raphaël and GS Consolat.
[1] He signed for newly promoted Ligue 2 side Quevilly-Rouen in July 2017.
[2] Mendy made his professional debut for Quevilly-Rouen in a Ligue 2 1–1 tie with Lorient on 29 July 2017.
[3] After three seasons with Quevilly-Rouen, Mendy signed for Laval on an initial one-year contract, with a second year subject to the club achieving promotion.