Liverpool's midfield were dominated by Real Madrid's in the last round. Chelsea cannot allow that to happen to them.
N'Golo Kante has trained ahead of this first leg and that could be huge.
Two years ago, when Chelsea beat Real in the semi-finals, Kante was man of the match in both legs, and again in the final against Manchester City.
Real are blessed with fine midfield options — Luka Modric, Toni Kroos, Federico Valverde, Eduardo Camavinga and Aurelien Tchouameni.
Kante will be itching to nip at their heels.