Liverpool suffered a humiliating defeat at the hands of Wolverhampton Wanderers on Saturday, proving that FA Cup upsets will continue past the 3rd Round in this season's competition.

In 18th position in the Championship table, Wolves are hardly flying high this season but put their Championship struggles behind them to produce a performance of the highest quality at Anfield.

Goals from Richard Stearman and Andreas Weimann provided the victory and despite a later surge from Klopp's men, held firm and fully deserved to progress into the last 16 of the tournament.

It's the latest in a series of poor results for Liverpool in January and questions are starting to be asked of the progress shown under Klopp. The German manager isn't necessarily under pressure, but the Reds need to start picking up wins soon.

These are the FIVE things we learned from the match...

The FA Cup is a great leveller

On paper, Wanderers shouldn't have had a hope of securing any sort of result at Anfield but as we've seen time and again, the FA Cup is the game's great leveller.

Wolves looked every bit a Premier League side and gave the Reds a tougher game than most sides that have travelled to Anfield this season.

There's something about the FA Cup that continues to inspire teams to play beyond themselves and even if you're having one of the best seasons of any side in England, you're still susceptible to the famous cup upset.

There's an argument that the gap between the Championship and top-flight isn't as great as people think, but the reality is probably just that as a one off, clubs can dream beyond their station and bring performance levels along with that.

Paul Lambert loves a trip to Anfield

Paul Lambert's record at Anfield is exceptional in competitive action. In five visits there as a manager he is undefeated, drawing two and winning three.

He set out his team perfectly to counteract the Reds on Saturday and clearly inspired his team pre-match given that they raced to a 1-0 lead within a minute.

His counter-attacking system worked perfectly against the pressure of the Reds and in the second half especially his side's defensive organisation was impressive.

Liverpool simply had no answer to the Wolves wall, even when established players like Philippe Coutinho entered the fray.

Weimann is already a Wolves hero

Weimann's first start as a Wolves player will be hard to beat. Struggling to find regular first team football at Derby, his loan move to link up with former boss Paul Lambert is already paying dividends.

The former Villa striker has never fully realised the potential many thought he had when he burst onto the scene at the Villans but performances like the one at Anfield prove he still holds plenty of quality.

The Austrian international took his goal expertly, bamboozling Loris Karius in the Liverpool goal to coolly slot home.

Regardless of how the rest of his loan spell goes, he's likely to be a cult hero with Wolves fans for years to come such is the importance of his effort.

Liverpool are definitely in a slump

It's been clear for quite some time that Liverpool's performance levels had dropped off from where they were in the first few months of the season but three defeats in a row at Anfield has really hammered home that the Reds are in pretty dire straits right now.

Jurgen Klopp needs to find answers to the increasing volume of discontent of supporters before Liverpool reach full blown crisis mode.

It's not like their fixtures get any easier either, with Chelsea visiting on Tuesday night in a massive Premier League encounter. Four home defeats in a row could be the tipping point

Liverpool don't have the squad depth to rotate so heavily

With Liverpool having such a heavy schedule right now it's perhaps understandable he'd looked to ring the changes against a Championship outfit, but what's clear is that Liverpool don't have the squad depth to make such massive changes.

The likes of Alberto Moreno, Joe Gomez and Ben Woodburn all looked far from the standard to play for an elite Premier League side.

Some of the players who came in were young of course and it's all part of their development to get first team action but perhaps Klopp should think twice in the future before putting together such a disjointed XI.