 Born in the French overseas department of Martinique, Lessort joined the youth ranks of Élan Chalon in 2010 and won the French national championship with Chalon’s cadet team in 2012 and 2013 and with their development team ("Espoirs") in 2013.He also helped Chalon win the 2013 Trophée du Futur.Lessort was handed his first professional contract by the club in June 2014 and made his debut in the French top-flight Pro A during the 2014-15 season.