Real Madrid vs Manchester City: 3 battles to watch out for | Champions League 2019-20

3) Sergio Ramos vs Sergio Aguero

Real Madrid CF v RC Celta de Vigo - La Liga

Sergio Ramos and Sergio Aguero are the longest and second-longest serving players for their respective clubs. And both players have been absolutely vital in the immense success of their clubs as well.

Ramos and Aguero are into the twilight of their careers and will be looking to maximize their time at the top level.

Aguero against Ramos represents an interesting battle. The ever-clinical Aguero needs the smallest of chances to score, while Ramos has been one of the best defenders of the past two decades.

Ramos will be looking to make his presence felt with crunching tackles and winning aerial duels. Aguero on his part will rely on his speed and look to play off the back of the last defender, in an attempt to beat the offside trap and capitalize on Madrid's lack of pace in defence.

But if Ramos can mark Aguero out of the game, City would need to rethink their approach.