Tottenham are reportedly keen on Valencia ace Shkodran Mustafi.
Spurs have seen Jan Vertonghen and Toby Alderweireld form the Premier League's best defence, and Kevin Wimmer even filled in well during Vertonghen's recent injury lay-off - but with Champions League football on the horizon, manager Mauricio Pochettino may yet consider adding some more depth to his back line.
German newspaper Bild report that Spurs have entered the race to sign Valencia star Mustafi, which would be a huge upgrade to the depth behind Alderweireld as the right-sided centre back.
Mustafi, 24, may be known by some having played in the Everton reserves and academy, but left the club in 2012 for first-team football with Sampdoria in Italy.
After starring for Sampdoria and winning the World Cup with Germany, Mustafi earned his huge move to Spain with Valencia, where he has gone from strength to strength and impressed in La Liga.
Valencia have struggled to keep hold of their best players in recent years though, as the likes of Juan Mata, David Silva, Jordi Alba, Juan Bernat, Roberto Soldado, Jeremy Mathieu and Nicolas Otamendi have all left the club - and Mustafi could follow suit.
Bild believe that Tottenham, as well as the likes of Barcelona, Atletico Madrid, Inter Milan and other unnamed English clubs are all keen on Mustafi, despite the fact that he has a €50m (£39.5m) release clause in his contract - meaning Daniel Levy may have to dig deep to land the German centre back this summer.
Do you think Spurs need to splash the cash on another centre back?