 In the 2010–11 season, Jung made 15 appearances as a reserve player for Auxerre, scoring 2 goals.However, he lost his first team place and even as a substitute during the 2011–12 season, and subsequently signed for Ligue 1 rivals AS Nancy on 16 September 2011, on loan until the end of the season.On 6 July 2012, Jung Jo-gook returned to FC Seoul and played until 2015 season except Ansan Police FC for military service.