The Reds defender admitted that the side did not expect to win as comfortably as they did against the Spanish club.
Liverpool defender Dejan Lovren told the club's Twitter account after the 3-0 Europa League semi-final second leg victory over Villarreal on Thursday night that the players did not expect to progress to the final so comfortably.
Trailing 10-0 from the first leg after Adrian Lopez's injury-time winner, Jurgen Klopp's side made the best possible start at Anfield as Bruno Soriano's own goal levelled the tie with just seven minutes gone of the return match.
Despite one or two scares in the first half, the hosts generally dominated proceedings, and though it took until after the hour mark for Daniel Sturridge to put them ahead in the tie, they never looked seriously troubled and Adam Lallana added some late breathing space by scoring a third.
Lovren, who was the hero of the remarkable tie against Borussia Dortmund in the quarter-final last month, admitted that Liverpool were not expecting some a comfortable victory but insisted that the result was enabled by the "amazing" support from the Anfield faithful.
The Croatian centre-back told the club's Twitter account: "It was a beautiful game, I think everyone enjoyed to watch that game. I think we didn't expect this result to be honest but we believed from the beginning.
"Like I said before the game, everything is possible here at Anfield, it's tough for every opponent to play here and expect something. The 12th player helped us today - the fans. The atmosphere was really amazing."
Liverpool's win booked their spot in a first European final in nine years, but they will face one of their sternest tests of the competition when they come up against Sevilla, who will be playing their third final in a row after winning the competition in each of the last two years.
However, the Reds have beaten Manchester United, Dortmund, and now Villarreal throughout the knockout stages, and they will have confidence that they can emerge victorious and seal a first trophy in four years after just seven months of Klopp's reign.