Southampton have signed Denmark international Mads Roerslev from Brentford on a four-year contract for an undisclosed fee.
Roerslev, who can play at right-back or wing-back, made 146 appearances for the Bees after joining them six years ago but has not featured for the Premier League club this season.
The 26-year-old began his career at FC Copenhagen and made his debut at 17 before joining Brentford in 2019. He spent the second half of last season on loan at Wolfsburg.
He told his new club's website: "I see Southampton as a really good team who controls a lot of games, works hard and suits my way of playing.