Diaz thought he had given his side the lead on 34 minutes when he slotted home after being played in by Mohamed Salah, but he was denied by the offside flag. Replays appeared to show Diaz was in line with the trailing leg of Cristian Romero.
VAR lines were not provided with the replays. PGMOL stated that VAR had failed to intervene with the decision and promised a full review into the incident.
A PGMOL statement read: “PGMOL acknowledge a significant human error occurred during the first half of Tottenham Hotspur v Liverpool.
“The goal by Luiz Diaz was disallowed for offside by the on-field team of match officials.
“This was a clear and obvious factual error and should have resulted in the goal being awarded through VAR intervention, however, the VAR failed to intervene.
“PGMOL will conduct a full review into the circumstances which led to the error.”
Nine-man Liverpool were beaten 2-1 by Spurs following Joel Matip’s 96th minute own goal.
Liverpool were reduced to 10 players after 26 minutes when Curtis Jones was shown a straight red card for his challenge on Yves Bissouma following a VAR intervention.
Diogo Jota received two yellow cards in the space of two second-half minutes as Liverpool played the final 21 minutes with nine men.
Cody Gakpo cancelled out Son Heung-min’s opener in first-half stoppage time and Klopp’s side appeared to have held on for a point, before Matip turned Pedro Porro’s cross into his own net in the 96th minute.
