Mikel Arteta will "only be satisfied" if his Arsenal side are given two points back for the VAR error that allowed Brentford's equaliser to stand in Saturday's Premier League match.
VAR operator Lee Mason did not draw the guidelines to check for offside on Ivan Toney's equaliser.
"It wasn't human error, it was not understanding your job," said Arteta.
"That's not acceptable, I'm sorry.
"It cost Arsenal two points that are not going to be restored so we are going to have to find those two points somewhere else in the league."
PGMOL chief refereeing officer Howard Webb has contacted Arsenal to "acknowledge and explain the significant error" that occurred.