The 54-year-old Klopp said that reaching the final was an outstanding achievement, and a very special occasion as the rivals were fighting really hard to negate the advantage of the first leg.
With striker Gerard Moreno a surprise inclusion in the Villarreal starting 11 on Tuesday night, the home side kicked off with a totally different attitude to the team that sat deep at Anfield last week and they got their reward as early as the third minute.
Unai Emery's men have a difficult task over overturning a 2-0 first leg deficit against Liverpool, who are arguably the favorites to win the competition.
It would take a near-miraculous recovery to deny Liverpool, 2-0 winners in the first leg, a third final in five seasons, but the Jurgen Klopp-led side is plagued by injuries, including forwards Roberto Firmino and Divock Origi.
With the Reds' second goal in Wednesday's 2-0 win over Villarreal, Sadio Mane became the third player to net 20 times for the club this season, emulating Mohamed Salah - who teed up the strike for his fellow attacker - and Diogo Jota.
In the 2018-19 season, Moreno was on the field for only a little over two-and-a-half hours in the Premier League. The main reason for Moreno spending less time on the field was Robertson's dramatic rise over the last couple of years.
