Lesage was born in Bourg-la-Reine. He played as a left winger at the start of his career, but then became an attacking midfielder. As an attacker, he was the joint-highest scorer (16 goals) in Ligue 2 in the 2006–07 season,[1][2] along with Steve Savidan from Valenciennes FC.
On 5 April 2017, he announced his retirement.[3] Lesage finished his career as the record all time goal scorer for both Le Havre AC and US Creteil-Lusitanos.[4]