Contrary to the hackneyed cliché, penalty shootouts are not a lottery. Scoring and saving penalties are skills in their own right, while strategy and psychology also play their part.
Reds will have to overturn a three-goal deficit away from home to make the semi-finals
The Spanish giants prevailed 4-3 on penalties after a 1-1 draw on the night meant the tie ended 4-4 on aggregate.