Florentin Pogba has signed a two-year contract extension that will keep the defender at St Etienne until 2018.Pogba, 24, elder brother of Juventus midfielder Paul, enjoyed a breakthrough season at the Stade Geoffroy-Guichard last term, making 16 Ligue 1 appearances."I thank the club, leaders, coaches and staff for giving me their trust," he told the club's official website."I have made good progress since arriving at ASSE. My start was a bit difficult because I was injured. Then [manager] Christophe Galtier offered me the opportunity to play and I seized my chance."I learned a lot off [fellow ASSE defenders] Loic Perrin and Moustapha Bayal Sall."My only goal is to play. In St Etienne, I have great challenges ahead and I hope that the club will continue to move up."Guinea international Pogba joined St Etienne from Sedan in 2012 and was loaned back to the lower league outfit for a season before returning to his parent club where he made his Ligue 1 debut in December 2013.