Signing a quality centre-back should be one of Unai Emery's biggest priorities this summer.
The Arsenal manager, who can crown a decent first season in England with silverware by beating Chelsea in next week's Europa League final, needs to strengthen his defence, especially if the Gunners are to compete in the Champions League next season.
Their quest for defensive reinforcements has seen them linked with a £35million move for Espanyol defender Mario Hermoso.
The 23-year-old has impressed for the Catalan club this season, also attracting interest from Bayern Munich and Paris Saint-Germain.
But is he a good fit for Arsenal? In the video embedded above, we take a closer tactical and statistical look at the player.