Barcelona snatched a 1-0 victory over Osasuna prior to Tuesday's kick-off at Reale Arena, where Madrid offered little without the suspended Vinicius Junior or the rested Karim Benzema.

Kubo – who joined La Real from Los Blancos last July – scored just past half-time and, after Dani Carvajal received his marching orders for two cautions, Ander Barrenetxea made sure of victory for the host.

Next week's Champions League semi-final clash at Manchester City appears the priority for Madrid now over LaLiga, where they trail leaders Barca by 14 points with five games to play.

Alex Remiro made an expert stop to deny Eder Militao with a sixth-minute header bound for the top-right corner before La Real steadied their early nerves.

Martin Zubimendi turned Alexander Sorloth's near-post flick-on onto the crossbar from point-blank range, while Thibaut Courtois repelled a glorious David Silva chance with his feet.

Mikel Oyarzabal saw a penalty appeal for a foul by Militao rejected as the hosts continued in the ascendancy, albeit without a first-half reward arriving.

Yet its dominance told immediately after the interval when Kubo capitalised on a stray Militao pass back to Courtois and poked into an empty net.

Matters worsened for Madrid as Carvajal was sent off for a second needless lunge on Aihen Munoz, before Barrenetxea sealed the deal in the 85th minute when he smashed a low finish into the bottom-left corner.