Southampton officially announced that Brentford defender Mads Roerslev has joined, and the two sides have signed a contract for 4 years.

In 2016, Rollslev, who was 17 years old, scored a goal for his debut for Copenhagen. Three years later, he became a member of Brentford. During his six years at Brentford, he helped the team advance to the Premier League in the second year. In the 2021 English Championship upgrade playoff final, he assisted 1 goal to help the team defeat Swansea 2-0.

On the court, Rollslev mainly plays as a right back or wingback. In the past four seasons, he has played 94 Premier League games for Brentford, helping the team gain a foothold in the English top league. During his time at Brentford, he played in 146 games.