By SABC Sport
2nd August 2023
The 24-year-old spent three seasons at Saints, playing 80 games and scoring one goal.
He has signed a five-year deal with the Ligue 1 side and leaves St Mary's ahead of Southampton's return to the Sky Bet Championship.
Monaco have moved to recruit a centre-back, with Axel Disasi expected to depart for Chelsea in the coming days.