Barcelona dropped their first points in LaLiga this season as Rayo Vallecano fought back to secure a 1-1 draw at home to the champions in a testy encounter on Sunday where a faulty VAR system caused controversy, Reuters reported.

Rayo substitute Fran Perez thrashed home a 67th-minute equaliser as he stole in unmarked at the back post from a corner after Lamine Yamal’s 40th-minute penalty had put Barca ahead.

A malfunctioning VAR ensured the game was clouded in controversy after Pep Chavarria's challenge on Yamal, which led to the spot kick being awarded, could not be reviewed because the system was not working at the time, according to Reuters.