After that heart stopping mother of all comebacks against Dortmund not so long ago Liverpool find themselves now in the need of another.
Adrian Lopez scored a stoppage-time winner from a brilliant pass from Denis Suarez.
Villarreal go into the next leg of the Europa Cup semi final at Anfield with a one goal lead.
Klopp is confident of another comeback at Anfield so more high drama is in store in that game next week.