Fermin Lopez opened the floodgates shortly after the restart, with Robert Lewandowski adding a brace to extinguish any hopes of a Newcastle comeback.

Raphinha completed the rout with two goals of his own, including one that capitalised on a calamitous error from Ramsey as Newcastle attempted to play out from the back.

The referee opted not to add any stoppage time at the final whistle, acknowledging that the visitors had endured sufficient punishment on a chastening evening in Spain.

The opening 45 minutes had provided a thrilling spectacle, with Newcastle refusing to be intimidated by their illustrious opponents.

Anthony Elanga struck twice to level the scores on each occasion Barcelona took the lead, expertly exploiting the hosts’ vulnerable high defensive line.

His first arrived in the 15th minute when Lewis Hall released him with a precise through ball, and the Swedish winger finished coolly into the bottom corner.

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When Marc Bernal restored Barcelona’s advantage just minutes later, Elanga responded again in the 27th minute, meeting Harvey Barnes’ low cross at the far post.

The drama intensified in stoppage time when Kieran Trippier tugged Raphinha in the penalty area, with VAR confirming the foul.

Lamine Yamal, just 18 years old, stepped up to convert from the spot, sending Barcelona into the break with a 3-2 advantage.

The second period proved catastrophic for Eddie Howe’s side, who conceded four times within a devastating 20-minute spell.

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Fermin Lopez struck first in the 52nd minute after escaping Sandro Tonali’s attention, receiving Raphinha’s perfectly-weighted pass before slotting home with composure.

The Italian midfielder’s evening ended shortly afterwards when he suffered a thigh injury, forcing Willock into action as a replacement.

Lewandowski then rose above Livramento to head home from a corner, before adding his second after Yamal’s intelligent pass released him behind the defence.

Raphinha sealed the victory when Ramsey’s misplaced pass across his own penalty area gifted the Brazilian an easy finish.

Newcastle’s defensive errors proved their undoing, with the visitors becoming architects of their own downfall throughout a punishing second half.

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Newcastle’s first-half performance had offered genuine encouragement, with their forward trio of Elanga, Gordon and Barnes causing Barcelona considerable problems.

Dan Burn produced a crucial intervention when he threw himself in front of Lewandowski’s shot during a two-against-one situation, demonstrating the defensive resilience that briefly unsettled the hosts.

The Magpies’ bold approach even rattled Hansi Flick’s coaching staff, who became involved in a heated touchline exchange that resulted in a yellow card for someone on the Barcelona bench.

However, maintaining such intensity for the full 90 minutes proved beyond Howe’s players, who were completely outplayed after the interval.

Barcelona’s victory sends a clear message to their remaining Champions League rivals, demonstrating that any team hoping to beat them must be prepared to outscore them.