Stindl opened up with a penalty and then there was no stopping him as Gladbach put their 1-0 first leg deficit behind them to progress to the next round.
Stindl fires home his first goal from the penalty spotGetty ImagesAnd he was lethal from the edge of the box, tooGetty Images
The German side had a huge mountain to climb when some sloppy defending allowed Kalinic to open the scoring.
A charging run through the middle by Federico Bernadeshchi was topped off by a wonderful pass into the striker’s path who made no mistake.
And the tie looked all-but over when Valero pounced on a comical mistake by Jannick Vestergaard to give the Serie A side a 3-0 advantage.
But the comeback was on when Max Olivera pulled down his opponent leaving Stindl to score the spot.
Lars Stindl was the star of the show with three quickfire goalsGetty Images
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Moments into the second half Moenchengladbach had a second when Stindl stabbed home at the back post from a corner.
Unbelievably by the 53rd minute Stindl had his and his side’s third when Jonas Hoffman’s clever free-kick was drilled home.
It was a wonderful comeback from the German side against all the oddsEPA
As the Serie A side pushed for a way back into the game knowing they were going out on the away goals, Christensen topped off a fairytale night for the visitors when he headed in from close range.
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