The 26-year-old spent last season on loan at St Mary’s Stadium from the La Liga giants, and impressed as the Saints challenged for a top four berth before securing Europa League qualification.
However, Southampton are hopeful of keeping hold of Alderweireld, and have opened talks with Atleti in a bid to thrash out a deal.
‘Keeping’ one of their better talents from last term is sure to be a priority for the South Coast club, who have already offloaded Nathaniel Clyne to Liverpool amid worries he may see out the last year of his contract and leave for free.
Manager Ronald Koeman has already suggested that Alderweireld is keen to make a permanent move to join his side:
“The player likes to stay,” he said. “We like to keep the player but it’s a little difficult at the moment with Atlético Madrid. I have a good hope he will stay for Southampton.”