Isaac Cossier

About

Isaac Cossier (born 30 November 2006) is a French footballer who plays as a centre-back for Ligue 1 club LOSC Lille.

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.

Individual
2025–26 Ligue 2 Young Player of the Season

Soccerway profile