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Moussa Sow began his professional career in 2004 when he signed for Le Mans. He spent three seasons with the club, making 41 appearances and scoring six goals. In 2007, he moved to RC Lens, where he scored 20 goals in 61 appearances. He then had spells with FC Lorient, RC Strasbourg, and Sivasspor before joining Al-Ahli Saudi FC in 2015.