Even the most ardent Reds fan may have had doubts about the team's chances of overturning a 3-0 deficit against one of the most illustrious teams of all time whilst without two of their key players.
With Mohamed Salah and Roberto Firmino out of action, Liverpool nonetheless made a bright start as Divock Origi netted in the first seven minutes, but with no further goals in the first half and Andrew Robertson coming off injured, the odds continued to look slim.
However, Robertson's replacement, Georginio Wijnaldum, went on to score a quickfire brace on 54 and 56 minutes, before Origi finished off from Trent Alexander-Arnold's clever corner kick to put Jurgen Klopp's side 4-0 up, with Barca unable to muster a response on the night.
The full-time whistle was met with sheer euphoria at Anfield while Twitter also went haywire at what had just happened, with Collymore one of the many people celebrating:
Messi! Cruyff! Pep! Gaudi! Joan Miro! Salvador Dali!— Stan Collymore (@StanCollymore) May 7, 2019
Your boys took one hell of a stuffing!!!
ADVANCE TO MADRID!— Stan Collymore (@StanCollymore) May 7, 2019
Fantastic, awe inspiring night of football proving Anfield, Liverpool and European football do indeed have something very special, whatever the vintage.— Stan Collymore (@StanCollymore) May 7, 2019
Superb @LFC, superb!
Collymore also cheekily called out top pundit Gary Lineker, known for having impressed as a player for both Everton and Barcelona (not to mention his celebration to Lionel Messi's free kick in the first leg):
Looking for @GaryLineker reaction to Liverpool's winner...— Stan Collymore (@StanCollymore) May 7, 2019
Come on ledge, give us a wiggle...
And some fans of various clubs had their say:
Why would he celebrate?? He is an Everton and Barcelona legend....— Matt Dudley (@Mattyd1385) May 7, 2019
Collymore— Ateh Charles (@castello125) May 8, 2019
Your cold Stanley— Freddy Leftagain (@FreddyLeftagain) May 7, 2019
Stop trolling famous people Stan— Dave Rushforth (@RU51HY) May 8, 2019
Now now Stan you would only sulk if he said something back— ste davis (@stephen74908384) May 7, 2019
Probably busy pulling down all his Messi posters!!— Mike stevens (@logsky) May 7, 2019
He’s gone hiding!!!!!— zumah (@mrzumah01) May 7, 2019
I would expect Gary and Rio will be running around with a Liverpool shirt on for a few weeks after that display. Considering their reaction to Messi’s goal.— Mark Edwards (@MarkEUFC) May 7, 2019
Liverpool's rout is the first time since 1986 - when Barcelona knocked out Gothenburg in the European Cup - that a team have recovered a three-goal first-leg deficit to win a semi-final in this competition.
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