5 things Liverpool must learn from El Clasico

#3 Liverpool's attacks should flow through their left

Nacho struggles to keep up with a flying Jordi Alba

Let's consider the options

Ever since coming back from that pericardium infection that threatened his career, Dani Carvajal - arguably the best right-back in the world till then - has looked a pale shadow of himself.

Hakimi Achraf is too green, too young, too naive to be risked at this stage; Madrid don't take such risks.

Lucas Vazquez is not a defender

'Nacho' Fernandez is solid, reliable, but does lack a yard or two of pace - as was ruthlessly exposed time and time again against a relatively slow Barca unit.

Right-back is a real problem for Los Blancos and Liverpool must do everything in their power to exploit this - Andrew Robertson's incessant running can create a massive headache, but even worse for Madrid, Sadio Mane's hitting peak form just in time for the Liverpudlians.

If Mane works himself into one-on-one situations against whoever occupies that flank for Madrid, it could be a long, long, night for Keylor Navas.