Centre-back: Jose Gimenez (Atletico Madrid)
The mortar to Atletico Madrid's brick, Jose Gimenez, has been a mainstay at the heart of their defence for years now.
Known for his tough and uncompromising style of defending, the Uruguayan reads the game excellently and uses his towering stature to dominate aerial duels.
Centre-back: Simon Kjaer (AC Milan)
As far as underrated centre-backs go, Simon Kjaer is somewhere at the top. He's known to wear his heart on his sleeve in every match and possesses an exemplary work rate.
He is averaging six clearances in the Champions League this season. That is a testament to his reading acumen, while having a penchant for crunch tackles and aerial duels.
Centre-back: Mario Hermoso (Atletico Madrid)
Marco Hermoso struggled to establish himself in Diego Simeone's XI during his first season at the club. But he has now become a mainstay at the heart of their backline.
He has been terrific in the Champions League this season. Hermoso has averaged two tackles and four clearances per game to shine bright for the side with his intelligent style of defending.