Howard Webb has claimed that VAR made a mistake in not sending off an Everton star in the Merseyside derby earlier this month.
After a feisty 2-2 draw in February - in which both sides were reduced to 10 men - Liverpool hosted their arch-rivals and secured a 1-0 win that put them further out of reach in the title race.
However the result was overshadowed by two controversial decisions by the officials; the sole goal of the game, and an early challenge on Liverpool star Alexis Mac Allister.
While PGMOL chief Webb believes the former was the correct decision despite a potential offside in the build-up, he admitted the latter was an erroneous call from the officials.