#3 Marquinhos | PSG
Lionel Messi reuniting with Neymar at PSG has grabbed most headlines. But centre-back Marquinhos continues to be a key player for the club.
Joining the Parisian giants in 2013, the 27-year-old enjoyed a prolific partnership with Thiago Silva. Once his compatriot left the club, Marquinhos evolved into one of the world's best centre-backs.
Thiago Silva was the key centre-back for PSG in recent years. But the star's move to Stamford Bridge paved the way for Marquinhos to assume leadership at the back for PSG. Marquinhos' technical abilities in the attacking and middle third have greatly elevated the Brazilian international to stardom. But his defensive attributes have also been key for PSG on many occasions.
#2 Virgil van Dijk | Liverpool
His early days at Celtic and Southampton saw Virgil van Dijk improve on his defensive abilities and prowess. However, his move to Liverpool catapulted the Dutchman to stardom. He has been brilliant for The Reds, guiding them to a Champions League and Premier League title in successive seasons.
Van Dijk is the prototype of the modern-day centre-back: He's good with the ball at his feet, strong in the tackle and ruthless in marking. He is also blessed with pace and aerial prowess. Liverpool have conceded just 11 goals in as many league games this season. That's mainly due to Van Dijk's defensive leadership and contribution.
#1 Ruben Dias | Manchester City
After Vincent Kompany's departure from Manchester City, the Cityzens were unable to find a key defensive cog until they landed Ruben Dias.
Pep Guardiola shipped off Nicolas Otamendi to Benfica, and brought Dias to City. The centre-back has fit brilliantly into the heart of City's defence, making the Premier League holders look like a complete team.
In his debut season with Manchester City, Dias proved to be the signing of the campaign.
His pace, strength, passing vision and leadership qualities set him apart, helping him win the Premier League Player of the Season award. The centre-back is just 24, which means City have a defensive pillar to rely on for a while.