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.
The on-loan Arsenal star was not guaranteed a starting place in the team at the start of the ongoing season.
