Rayo Vallecano were left seething as a VAR failure meant Lamine Yamal 's first-half penalty could not be reviewed during Sunday's 1-1 draw with Barcelona .

Yamal converted from the spot in the 40th-minute after colliding with Pep Chavarría , with Rayo's players convinced the decision should have been overturned.

However, MEDIAPRO, the company who administers VAR in LaLiga, confirmed after the game that the technology was not working in the first half at Estadio de Vallecas.

"A technical problem, the causes of which could not be determined, prevented the proper functioning of the VAR service during the first half of the match between Rayo and Barça," a statement from MEDIAPRO said.

"Despite the efforts made by the entire technical operations team, it was not possible to properly

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