The 22-year-old is the latest to have impressed for Austrian side Red Bull Salzburg this season, and Mauricio Pochettino has sent scouts to watch him in action.
Saints chief scout Bill Green flew to Austria this week to watch the defender in Europa League action, and came back with a glowing report for the Saints boss.
The South American has enjoyed a fine season since making his debut last summer.
He has since racked up 42 appearances for the Austrian’s, and also contributed four goals.
His centre back partner Martin Hinteregger has attracted interest from the likes of Arsenal and Manchester United, and it seems Ramahlo could follow him to the Premier League this summer by moving to the south coast.