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Huijsen's dismissal came in a chaotic first half, but goals from Kylian Mbappe and Arda Guler ensured Madrid made it four wins from four in its quest for the top flight title.

Madrid thought it had made a lightning start through Arda Guler's second-minute strike, but the goal was ruled out for an offside against Mbappe after a video assistant referee (VAR) review.

Xabi Alonso's side did get its nose in front in the 12th minute through Mbappe, who capitalised on Mikel Goti's wayward back-pass before stroking the ball past Alex Remiro.

A red card for Huijsen threatened to turn the game on its head in the 32nd minute, with the defender handed his marching orders for a last-man foul on Mikel Oyarzabal.

But just a minute after Dani Carvajal struck the woodwork, Los Blancos doubled their advantage when Mbappe pulled the ball back for Guler to prod into the top-right corner.

Sociedad fast start after the break was rewarded when Oyarzabal's 55th minute penalty reduced the deficit after Carvajal was penalised for handling Ander Barrenetxea's cross.

Madrid was forced to withstand a wave of late pressure, with a Thibaut Courtois mistake almost handing the hosts a point, but Alonso's men were able to hold on for the win.

"I thought it was a clear yellow card watching from the sideline and, after taking a close look at the replay, I'm even more sure that it wasn't worth a straight red," Alonso said after the match in reference to Huijsen's red card.

"But I'm proud that my players kept fighting and came out with a win, we had good chances to score more goals and held on well on the back. I was very positive to see the collective effort and team spirit they showed on the pitch today."