Sarr started his professional career at the age of 18 when he signed for Metz in Ligue 1, the top division in French football. He quickly established himself as a key player for the club, impressing fans and scouts alike with his technical skills and vision on the pitch. After a successful spell at Metz, Sarr was signed by Tottenham Hotspur in the summer of 2021 for a reported fee of around $15 million.