Mathieu Debuchy signed with Ligue 1 club AS Saint-Étienne on a free transfer .
On 31 January 2018 , six months before the expiry of his contract with Arsenal , Debuchy signed for Ligue 1 club AS Saint-Étienne ; his contract with Saint-Étienne would run until the end of the 2017–18 season .
Mathieu Debuchy