Jurgen Klopp cautioned Liverpool against resting on its stunning Europa League comeback over Borussia Dortmund on the eve of the semifinal tie against Villarreal.

Liverpool was 3-1 down on the night and 4-2 behind on aggregate after halftime against Klopp's former employers at Anfield before launching a stunning three-goal turnaround, capped by Dejan Lovren's stoppage-time winner.

The Reds take on Villarreal at El Madrigal on Thursday, an opponent which Klopp expects to put up a stern challenge in the battle for a place in next month's final in Basel.

"Experience is not to buy or talk about, it's to get and use. But if you use experience in the wrong way then it’s b******t," he said. "Thinking about the result is not one percent for preparation of the game. It is always about the performance.

"When I came in October, Basel wasn't a real thing to think about, now it's not far away. Villarreal have made lot of good decisions to be here. We should not hope they only make bad decisions."

Out-of-favor striker Christian Benteke traveled with the Liverpool squad in the injury absence of fellow Belgium international Divock Origi.

Klopp stated he was ready to use the former Aston Villa man and added: "We haven't brought any tourists."

The Liverpool boss was reluctant to offer his thoughts on the Mamadou Sakho affair after the center back accepted his UEFA doping charge.

France international Sakho tested positive for a banned substance after Liverpool's 1-1 draw against Manchester United in the Europa League at Old Trafford last month. The 26-year-old is not formally suspended by club or governing body yet, but he did not request a B sample to be tested ahead of Tuesday's deadline.

"There's really nothing else to say," Klopp said. "What they're all doing is collecting info to clear the situation up. We have to wait for next steps."