Lee Mason will no longer officiate in the Premier League after leaving referees' body PGMOL by mutual consent.
Mason, as the Video Assistant Referee, did not draw the guidelines to check for offside on Ivan Toney's equaliser.
"We would like to thank Lee for his dedicated service to the professional game and wish him all the best for the future," PGMOL said.
Following the draw with Brentford, Arsenal then dropped to second in the table after they were beaten 3-1 by Manchester City in midweek - a result that moved Pep Guardiola's side into top spot.