Saints midfielder Morgan Schneiderlin has signed a new contract at the club that runs until the summer of 2017.
The 23-year-old told the club's website: “I am a very happy man. To commit my future to Southampton is a big thing because this club has big ambitions – and I have big ambitions as well."
Schneiderlin joined Saints in 2008 from RC Strasbourg in a deal worth up to £1.2m.
The French player has made 185 appearances for the club, and is currently enjoying an impressive first season in the Premier League.
Saints manager Mauricio Pochettino added: "I am delighted that the club has been able to extend Morgan’s contract.
“During my short time with Southampton, Morgan has shown what a capable player he is and has demonstrated his potential to become one of the Premier League’s most complete midfielders."