In EPL news, Diaz's goal for Liverpool at Tottenham was incorrectly disallowed due to "significant human error", PGMOL has admitted.
At 0-0 and with the Reds a man down, Diaz's goal was ruled out by an unusually quick VAR decision in which the customary offside line graphic was not shown.
"PGMOL acknowledge a significant human error occurred," the statement read.
"PGMOL will conduct a full review."
"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.
The Reds also had Curtis Jones and Diogo Jota sent off, and lost to a stoppage-time Joel Matip own goal after resolutely keeping Spurs out.
In EPL news, Speaking after the match, Jurgen Klopp said his side's defeat came in "the most unfair circumstances" with "crazy decisions".
"That is not offside when you see it," he told Sky Sports.
"The ball is between Mo [Salah]'s legs, they drew the line wrong and didn't judge the moment when Mo passed the ball right."
Klopp said the statement "doesn't help" and referenced the apology Wolves received for the decision not to award a penalty at Manchester United earlier in the season.
"I don't think we should talk too much about that because it doesn't help at all," said Klopp.
"Wolves got a similar statement, or apology. They didn't get a point out of United and we won't get a point today so it doesn't help.
"I am pretty sure no one is making mistakes on purpose but it still happened and at this moment I don't know why. [We] scored a fantastic goal – would it have changed the game? I don't know. But probably, because goals help."
Liverpool captain Virgil van Dijk said he is "losing faith" in VAR after the referees' incorrect decision to disallow Diaz's goal without any intervention from Stockley Park.
"I'm losing faith, [which] is difficult to say," he said.
"The VAR should be absolutely clear and obvious with everything they're deciding on. I've seen the still back – on live TV there were no lines being shown. It's all a bit strange, I don't know who was in the VAR room and making that decision. It's not a good thing, it doesn't look well either. It is what it is, we lost."
In other EPL news, Gary Neville told Sky Sports the decision was "horrendous" and said it was "clear for everyone" to see that Diaz was onside.
"That is unbelievable! It is very significant. I have defended VAR and offsides being a matter of fact, but there have been a few which I thought were wrong in recent weeks," the former Manchester United defender said.
"It was all too quick. That is a horrendous one. It is clearly onside, clear for everyone. Something hasn't been right the last few weeks. They are picking the wrong cameras to draw the lines on. It is weird."
Jamie Redknapp added: "Everyone will agree, this is onside and makes you wonder how many other decisions they got wrong. It looks like they got that wrong by a yard. It is not a good look. For me they got that so badly wrong. We are making things so complicated."