Career
Metz
Koulibaly began his career playing for hometown club Social Research Saint-Dié and spent two seasons playing on the club"s senior team in the Championnat de France amateur 2 before joining the academy of professional club Metz on 1 July 2009. He also played on the club"s amateur team in the Championnat de France amateur appearing in 15 matches as Metz were crowned champions of the league finishing with 107 points. Prior to the start of the 2010-2011 season, Koulibaly signed his first professional contract agreeing to a one-year deal.
He was, subsequently, promoted to the senior team by new manager Dominique Bijotat.
Koulibaly made his professional debut on 20 August 2010 in a league match against Vannes. He appeared as a substitute in a 1–0 victory.
Genk
On 29 June 2012, Koulibaly joined Belgian club Racing Genk after agreeing to a four-year deal. Napoli
On 19 May 2014 Koulibaly was sold to South.S.C. Napoli in Italy.
International Kalidou Koulibaly was born and raised in France by Senegalese parents, and was therefore eligible for both nations.
He played for the U-20 French side starting in 2011. However, in early September 2015, Koulibaly changed federations and joined the Senegal national football team, despite the interest to call him for Les Bleus from Didier Deschamps. He made his debut on 5 September 2015 in an AFCON qualifier against Namibia in a 2–0 victory.