Cheikh Sidy Bouya M’Bengue was born 23 July, 1988 in France. He is a professional footballer who plays for French club Saint-Étienne, as a left-back. He has played professional club football for Toulouse and Rennes. He represented them at youth level before playing for the Senegal senior side.
M’Bengue has been with his hometown club Toulouse since he was seven joining the club’s juvenile team. He played frequently with the club’s underage teams slowly ascending the ranks. Following the 2006–07 season, he graduated from the club’s youth academy and was promoted to the club’s Championnat de France amateur squad. During the 2007–08 season, he earned call ups to the first team and eventually made his debut on 15 September 2007 against Marseille coming on as a substitute in a 2–1 victory. Two weeks later, Cheikh appeared as a substitute again in a 1–0 win over Sochaux. He made his first start the following week in a 2–0 defeat to Saint-Étienne.
After just a few matches into the 2007–08 CFA season, Sidy was embroiled in controversy. While playing in a match against the second team of AS Monaco, he committed a dangerous foul on an opposing player. He was swiftly given a yellow card, however, after realizing the severity of the player’s injury, the referee decided to send off M’Bengue. The French Football Federation responded by suspending him 13 matches, which effectively made him ineligible for play until March 2008.
In the summer of 2013 M’Bengue declined to extend his contract with Toulouse that was expiring in 2014. Clubs such as Sunderland and Besiktas showed interest. However, on August 25 M’Bengue transferred to Stade Rennais and signed a deal that lasts until 2016. The transfer fee was expected to be around €2m. On 20 July 2016, he joined Saint-Étienne on a free transfer.
Cheikh made his French under-21 debut on 19 November 2008 against Denmark in a 1–0 victory. He was a part of the 2009 Toulon Tournament squad that reached the finals; however, due to picking up an injury, he missed the match. In May 2011, he announced that he would represent the Senegal national team at senior international level after previously representing France at youth level. On 9 May 2011, the manager of the Senegal national team, Amara Traoré, confirmed that M’Bengue would be representing Senegal at senior international level, and on 4 June 2011, he was cleared to play for Senegal, making his international debut later that month.