Manchester United desperately need to sign a new striker, but Jose Mourinho is still looking to strengthen his defence ahead of the new season.
Victor Lindelof has already signed from Benfica, and Eric Bailly had an impressive first season at Old Trafford.
Chris Smalling, Phil Jones, Marcos Rojo, and on occasion, Daley Blind, are his other options at centre-back.
AS report that Mourinho would like to add Marc Bartra of Borussia Dortmund to that list, as he thinks he would fit into his current squad with ease.
The Spain international missed the end of the season after suffering a broken wrist in the bomb attack on the BVB bus ahead of their Champions League game against Monaco.
The former Barcelona man still featured 31 times for the Bundesliga outfit last term under recently-departed Thomas Tuchel.
Metro suggest United also held an interest in re-signing Michael Keane, though the England international has now signed for Everton, which could lead them to step up their interest in Bartra.