Barcelona striker Luis Suarez was deemed to have fouled Leganes goalkeeper Ivan Cuellar in the Blaugrana's second goal on Sunday night.
The Leganes players surrounded the referee, Burgos Bengoetxea, but he did not check with the VAR.
"I think there is a foul by [Suarez] on Cuellar," said Juan Andujar Oliver on Radio MARCA's 'Marcador' programme.
"The Barcelona striker hits the Leganes goalkeeper.
"Burgos Bengoetxea should have checked the [VAR] monitor.
"It cannot be the case that these moments are refereed in Las Rozas but not by the referee himself on the pitch."
Barcelona went on to win the match 3-1.