 After helping earn Troyes promotion to Ligue 1, the 19-year-old signed for Lille in July 2012, as cover for Mathieu Debuchy.Sidibé made his debut for Lille on 25 August 2012 against OGC Nice, the start was his first appearance in Ligue 1 and he marked it with a goal, scoring a 59' minute equalizer in a 2–2 draw.In Lille's 2012–13 UEFA Champions League group stage matchday 5 game against BATE Borisov in Minsk on 20 November, Sidibé helped Lille avenge their 3–1 matchday 1 home defeat against BATE Borisov by scoring from a long angled strike in the first half.