The Blues hold the aces coming into this game, having already won the first leg in Bucharest last month. A second half goal from Olivier Giroud settled matters at the Arena Nationala.
Thomas Tuchel’s men will have to avoid defeat against Diego Simeone’s side in order to stand the chance of qualifying for the quarter-final for the first time since the 2013/2014 season.
Christensen has warned the West Londoners against complacency, insisting the tie is far from over and Chelsea must put up another majestic show to qualify at the expense of the Spaniards.
The Denmark international said to the club’s website: “That’s kind of a focus point for the whole team”
“We have to be very comfortable on the ball and we don’t just play to play – there’s a reason behind every step we take with the ball and every pass.”
Chelsea have looked more of a unit under their new German coach and Christensen also explained the reason behind their recent unbeaten run.
“The reason we’ve been solid as a team is that we’ve been working hard as a team, with a high press and sometimes suffering together if we have to,” he added.
“I think it’s inevitable, with the players we have, that they’re always going to have their moments, with the skills and the talent that we’ve got here.
“As we get better and better as a team, people are going to express themselves in every way they can. I think we can look forward to that even more.”