Chelsea will go to Spain for the second leg, trailing 3-1 overall.
"We weren't performing at our best," Christensen said on the club's website.
"We had a good start for 10 or 15 minutes, with good enthusiasm from the crowd – and they stuck with us the entire game - but they managed to take the tempo out of the game. We have already given up seven goals in two games, which is unusual for us. It's not just this game; we did it over the weekend as well. We've got to fix it, and we've got to do it quickly."Chelsea are fortunate, according to Christensen, that the away-goal rule is no longer in effect, since they face a mountain to climb.It's two goals, and while it'll still be challenging, it can't be any worse. We need to go there and put on a great show.We must strive to turn things around, but it will be difficult. We weren't on top, and we knew it, but we had nothing to lose, so we had to go there, give it our all, and hope to turn things around."me."
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