#2 Engine room battle and counter threat
Midfield duo of Toni Kroos and Luka Modric haven't particularly influenced matches this season. However, the result in Kiev could well be decided in the middle of the park.
Modric and Kroos will need to be at their best, pulling the strings and exerting control. Controlling the ball in midfield will help Madrid starve the likes of Salah and Mane of possession.
Liverpool's front three have bagged 29 goals in Europe this season, so cutting the supply to them will be important.
Liverpool are one of the most dangerous teams in Europe on the counter-attack.
They break in numbers, with Jordan Henderson and James Milner spraying passes. The fullbacks overlap, while the wingers drift inside.
To weather the Scouse storm, Zidane will have to start Casemiro, The Brazilian defensive midfielder will protect the back-line and will be tasked with breaking up Liverpool's attacks.
Zidane has been known to approach attacking teams with caution, and he will need to do so against Liverpool.