Diego Simeone's side were controversially denied a goal in the shootout, despite Julian Alvarez finding the back of the net for Atletico's second penalty.
His shot was ruled a miss because the ball ricocheted off his left foot after he initially kicked it with his right.
As per the FA's website, one of the rules of football when taking a penalty kick states: 'The kicker must not play the ball again until it has touched another player.'
In a penalty shootout, this rule is altered, as the kick-taker cannot make contact with the ball at all after it initially leaves their boot (as this would allow players to score rebounds).
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