Midfielder Harrison Reed has signed a four-and-a-half-year contract to extend his terms with Southampton until 2021.
The 21-year-old, who is a product of the club's academy, has made 25 appearances since making his first-team debut in December 2013, including four this season.
He has also represented England at under-20 level.
"This is the right place for me, you see it time after time that young players get opportunities," said Reed.