Jurgen Klopp's Liverpool are gearing up for a pivotal two-legged tie against Villarreal with a place in European final at stake - this is not unfamiliar territory.
The two teams have met at the same stage before, only the stakes were a tad lower given their 2016 clash in the Europa League while this season's will determine who reaches the Champions League final.
That's not to suggest the meeting six years ago was anything less than fiery, as tempers flared both on the pitch and in the technical areas.
