The Denmark international was linked with Tottenham last week. Spurs manager Jose Mourinho has approved a move for Vestergaard as he seeks to strengthen his defensive options for next season.
Vestergaard's value to Southampton has been confirmed in his absence this season. Saints were seventh on the Premier League table before he collected a knee injury in December and they slipped down the ladder in his absence. He also missed the 9-0 defeat by Manchester United at Old Trafford.
- updated April 13