Championship club Wolverhampton Wanderers caused a major FA Cup fourth round upset at Anfield to end one of the worst weeks of Jurgen Klopp's managerial career.

Wolves rocked Liverpool with a marginally offside header by Richard Stearman after just 53 seconds and added a second shortly before the interval with a classic counter-attack goal taken by Andreas Weimann.

Liverpool, who were beaten at Anfield by Swansea last weekend and again in the League Cup by Southampton on Wednesday night, threw on big-hitters Philippe Coutinho and Daniel Sturridge to try and rescue the tie but their only reward for 80% possession was a late consolation by Divock Origi.

As expected, Klopp made extensive changes with Roberto Firmino the only outfield player who retained his place from the Southampton semi-final and it didn't take long for Wolves, roared on by eight thousand fans, to take advantage.

Alberto Moreno fouled Dave Edwards in the opening minute and when Helder Costa swung over a free-kick, centre-half Stearman peeled away at the far post to head in.

It was Stearman's first goal in his second spell for the club that he joined on loan from Fulham in the summer.

Though replays also indicated the set piece had been taken a few yards ahead of where the foul had been committed, it didn't stop the celebrations with Paul Lambert, who won a Champions League winners' medal as a player with Klopp's former club Borussia Dortmund, punching the air in delight.

Liverpool's youngsters look rattled and 17-year-old forward Ben Woodburn was forced into a last-ditch challenge to stop Costa after the dangerous Portuguese winger had gone past four defenders on a rampaging run.

As he bit the turf, Costa furiously claimed a penalty and it was marginal whether Woodburn got the ball or the man first.

Liverpool bossed possession but 20-year-old Wolves goalkeeper Harry Burgoyne had little to do on only his third senior appearance.

Indeed, the visitor's only scare in the first half came when Costa failed to stop in time and twisted his ankle stumbling into an advertising hoarding.

Liverpool's only threat in the first half came from 19-year-old winger Ovie Ejaria who had a reasonable penalty shout waved away by referee Craig Pawson when Stearman leaned his body into the Reds youngster.

Wolves then doubled their advantage after 41 minutes to leave Lambert, normally dour, doing a full touchline jig.

It was counter-attack at its best. Liverpool's attack broke down on the edge of the Wolves penalty area and two passes later, it was in Loris Karius' goal.

Again, Costa was the main provider. Recovered from his ankle knock, he easily advanced past a stumbling Moreno, and slid a pass into Andreas Weimann, who rounded the Liverpool 'keeper easily to score.

It was the Austrian's first start for Wolves having signed on loan from Derby earlier the month to be reunited with his former Villa boss Lambert.

As the half-time whistle blew, there were boos at Anfield though there were also disputes between fans about whether to get behind the team or criticise. It showed how much Sadio Mane has been missed since he departed for the African Cup of Nations with Senegal.

Wolves are big fish in The Championship but are struggling in the lower reaches. Being underdogs and allowed to hit on the break played right into their hands in the first half.

Klopp sent on Coutinho, who signed a new five-year contract with the club last week, on for right-back Connor Randall at the interval knowing that Liverpool required a big response.

Ejaria's pace forced Kortney Hause to pull him down. And when Woodburn's free-kick was flicked on by Firmino, it struck Ragnar Klavan on the thigh from close range and rolled wide. Firmino then opened up the Wolves defence but Moreno just failed to reach his cutback.

When Coutinho's low drive was held by Burgoyne after an hour, there were ironic cheers as it represented the home side's first shot on target.

Daniel Sturridge came on from Firmino after 65 minutes, the striker getting a hug from Klopp on the touchline as he prepared to make his introduction.

Lambert then withdrew Costa who had performed heroics on a dodgy ankle with Connor Ronan coming on. Wolves fans chanted 'Sign him up' in appreciation of Costa's performance. He is currently on loan from Benfica with the Midlands club contemplating a £13million move to make his stay at Molineux permanent.

Klopp threw on his final substitute Emre Can for the last 15 minutes to try and give Liverpool some midfield control they'd been lacking.

It worked to an extent. Burgoyne saved comfortably from Sturridge and Coutinho blasted over from 25 yards before the Wolves defence was finally breached after 86 minutes.

Sturridge rose well in a crowded box to head across the six-yard line and Origi steamed in at the far post to lash the ball home.

If lifted the atmosphere and amidst a crescendo of noise. Burgoyne had to stick out a leg to clear Origi's low shot from point-blank range after the ball bounced around the area like a pinball machine.

Wolves had a chance to make it 3-1 through Jon Dadi Bodvarsson but a one-goal cushion ultimately proved enough.