Atletico Madrid captain Koke insists they can fight-back against Chelsea.
Chelsea took control of their Champions League round 16 tie with a 1-0 first-leg win.
But Koke says: "It was a difficult game, we tried to do the things we had prepared and we didn't take any risks, even if we didn't manage to score.
"We just have to think about the return, to win.
"The challenge was decided by an action that seemed harmless, instead Giroud pulled out an extraordinary goal."
