Southampton are reportedly in negotiations over a permanent move for Toby Alderweireld
Alderweireld, 26, joined Atletico from Ajax back in 2013, but found first team football hard to come by in his first season in Spain, and eventually decided to join Southampton on loan last summer.
Saints manager Ronald Koeman was well aware of what the Belgian international could do having managed against him as Feyenoord boss - and his gamble has paid off.
Alderweireld has been superb this season, serving as a perfect replacement for Dejan Lovren, who was sold to Liverpool just weeks before Alderweireld's arrival.
However, his performances have reportedly attracted interest, with the Daily Mirror recently suggesting that Tottenham are lining up a summer move to reunite him with Belgium and former Ajax team-mate Jan Vertonghen.
Now, in a bid to keep Alderweireld out of the clutches of their rivals, Southampton are allegedly pressing ahead with a permanent move before the transfer window opens.
The Telegraph report that Southampton are in discussions with Atletico to seal the deal, paying around £10m to secure Alderweireld on a full-time basis - and possibly leaving Tottenham to go back to the drawing board when it comes to defensive targets.