MANCHESTER UNITED boss Jose Mourinho's search for a central defender has taken him to Lucas Hernandez.
The highly-rated 22-year-old has made 12 appearances for World Cup-winners France this year.
His versatility - Lucas can play at left-back and central defence - has made him all the more desirable for United.
Atletico offered the defender a new contract in June which he signed, keeping him tied to the club until 2024.
The La Liga outfit bumped his release clause up to £72m at the same time in an attempt to put off potential suitors.
But according to France Football, both Real Madrid and Manchester United have not been put off by the increase.
Mourinho was refused the funds to sign Harry Maguire and Toby Alderweireld this summer.
But after United's poor start to the season, January signings remain a distinct possibility.
Lucas is reportedly happy at the Wanda Metropolitano, but a move to Old Trafford or the Bernabeau would be hard to turn down.
Lucas Hernandez is reportedly on Real Madrid and Manchester United's radar
Lucas Hernandez helped France win the World Cup
Mourinho wants to bolster his back line
"Atletico Madrid are the club of my life," he said when penning his new deal in June.
"They've given me everything and I'm very happy with my renewal because it was what I wanted most.
"They've always trusted me, since I came into the youth team and gambled on me, I'm very grateful.
"For me it's an honour to have been part of our academy and have made it to the first team, with the club gambling on me like that.
Hernandez has risen through the ranks rapidly at Atletico
"I can't do anything else than thank them for their trust and pay them back on the pitch."
Lucas recently backed his team-mate Antoine Griezmann to win this year's Ballon d'Or.
"Griezmann deserves [the Ballon d'Or] and, for me, he is the favourite [to win it]," he told France Football.
"He has excelled in all the competitions he has played this year. It is Griezmann's year."