The last time Jurgen Klopp visited Stadio San Paolo, Naples witnessed its biggest eruption since Mount Vesuvius buried Pompeii.
It was September 2013 and the red mist descended amidst the white-hot atmosphere during Borussia Dortmund's Champions League clash with Napoli.
"Pathetic,” was Klopp's brutally honest assessment of his behaviour which resulted in a two-game European touchline ban.
The German coach had to watch most of the game on a TV in the stadium after being sent off inside half an hour for an angry outburst at the fourth official.
Teeth gritted, his eyes bulging – the footage of him ranting went around the globe. Klopp was furious that defender Neven Subotic wasn't allowed back onto the pitch sooner after an injury, allowing Gonzalo Higuain to open the scoring as Napoli went on to clinch a 2-1 win.
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