Here are our views on the best defender from each of the 7 continents.
John Brooks has become the most expensive US footballer in history after making the move from Hertha Berlin to Wolfsburg for a reported €20m ($22.5m). The previous record belonged to Jozy Altidore, who moved from AZ Alkmaar to Sunderland for €10m in 2013.
Mamadou Sakho will reportedly cost Southampton or Crystal Palace an eye-watering £30 million.
The 23-year-old Hertha Berlin centre-back is reportedly being eyed by several English clubs after impressing at the Copa America Centenario with the US national team this month.
James Milner's stoppage-time penalty helped Liverpool secure all three points against Leicester City over the weekend in what was a drama-filled encounter.
Rangers are giving Cameron Gascoigne a chance to earn a deal at Ibrox.
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Tottenham Hotspur defender Toby Alderweireld has faced criticism over his performances so far this season.
Whilst Andy Robertson has been enjoying great success with Liverpool at club level, he has struggled to help Scotland on the international stage.
William Saliba will be arriving at Arsenal in the summer of 2020.
James Milner scored the winner as Jurgen Klopp's Liverpool secured their eighth Premier League win of the season on Saturday.
Tottenham Hotspur could be on the look out for a new manager, if Mauricio Pochettino doesn't turn his side's results around soon.
Rangers are reportedly set to bring Ross Wilson to Ibrox.
Leeds United star Pablo Hernandez is on the sidelines at the moment.