Isaac Cossier (born 30 November 2006) is a French professional footballer who plays as a centre-back for Ligue 1 club LOSC Lille.
Club career Cossier is a product of the youth academies of the French clubs Olympique Noisy-le-Sec and Drancy, before moving to Lille on 26 July 2022 where he signed a professional contract until 2025. In 2024, he was promoted to Lille's reserves in the Championnat National 2. On 2 September 2025, his contract with Lille was extended until 2027, and he was loaned to newly promoted side Ligue 2 side Le Mans on a season-long loan. He was named the "Ligue 2 Young Player of the Season" and helped Le Mans earn promotion to Ligue 1. He returned to Lille in the summer of 2026, and on 17 July 2026 extended his contract with the club until 2030.
Career statistics
+ Appearances and goals by club, season and competitionClubSeasonLeagueCoupe de FranceEuropeOtherTotalDivisionAppsGoalsAppsGoalsAppsGoalsAppsGoalsAppsGoalsLille II2024–25Championnat National 1161———161Lille2025–26Ligue 1000000—002026–27Ligue 1100000—10Total100000—10Le Mans (loan)2025–26Ligue 224140——281Career total412400000452
Honours Individual 2025–26 Ligue 2 Young Player of the Season
References
External links