Jurgen Klopp warns Borussia Dortmund fans: I will celebrate if Liverpool score

Klopp spent seven years at the club, bringing them huge success and elevating them to one of Europe’s top sides.
His departure in May was accompanied by a great emotional outpouring of gratitude from supporters - the same fans he now hopes to disappoint at Signal Iduna Park in the first leg of the Europa League’s showpiece quarter-final.