Career
Mamadou can play as either a defender or a holding midfielder and joined Le Mans"s CFA squad in 2007 after arriving from Paris Football Club. His performances in the CFA earned him a call up to the senior squad. He made his professional debut on February 7, 2009 in a Ligue 1 match against Toulouse coming on as a substitute in the 80th minute. Le Mans lost the match 0–2.
Due to the suspension of defender Grégory Cerdan, Mamadou was called up to the senior squad again, this time for their match against Lille on February 17.
On March 6, he agreed to his first professional contract, signing a three-year deal with the club