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Watford was the English club Sarr played for prior to joining Marseille. He joined Watford in the summer of 2016 and made his debut for the club in August of that same year. During his time at Watford, Sarr quickly established himself as a regular starter and made a total of 83 appearances for the club, scoring seven goals. He left Watford in the summer of 2021 to join Marseille.