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Dani Olmo and Raphinha had got the ball rolling in the second half, after Hansi Flick's side had been frustrated by their visitors before the break.

It took until first-half stoppage time to get the first chances of note, with Joan Garcia smothering Ilyas Chaira's tight-angled effort, before Raphinha saw a similar effort parried by Aaron Escandell at the other end.

But Barca came out brighter after the break and took just six minutes to break the deadlock; David Carmo was caught playing out from the back, and Olmo drilled his low shot into the bottom-left corner.

And another lapse gifted Barcelona their second. David Costas, high in his own half, played a very slack backpass, which Raphinha pounced onto before chipping Escandell, who was well off his line.

But Yamal, who had seen an early shot parried by the goalkeeper, sealed the points as he acrobatically met Olmo's cross, giving Escandell no chance.