Dusan Tadic has signed a new four-year contract with Southampton, committing him to the club until 2020.
Tadic, 27, joined Saints from Dutch side FC Twente in 2014, with the midfielder going on to score 13 goals.
Speaking to the official Southampton website, he said: "I am really pleased.
"I have had two beautiful years here and a great connection with the supporters and everyone in the club -- all the players and the staff.
"I am really happy that I have signed a new contract. The club showed a lot of effort to keep me.