Arsenal are on their way to the Europa League semifinals, but plans are underway to strengthen their back line with a move for Borussia Dortmund star Sokratis Papastathopoulos.
The Greek international is a target for the Gunners, according to Gazzetta dello Sport, with the German club under pressure to sell due to his contract expiring in 2019.
The 29-year-old will cost in the region of £25m, though Arsene Wenger will face competition from Juventus, Chelsea and Manchester United.
Jose Mourinho wants another defensive target too, with Le 10 Sport claiming the Red Devils will move for Monaco star Djibril Sidibe.
The 25-year-old is versatile and can play as a full-back on either flank, with Matteo Darmian, Luke Shaw and Daley Blind all linked with moves away from Old Trafford.