BBC Sport looks at key questions around the VAR incident involving Tottenham and Liverpool and what impact the technology has had on the game.
The mistake that saw Liverpool have a goal wrongly disallowed in their 2-1 loss to Tottenham on Sunday has sparked more debate about the use of the video assistant referee.
Former Manchester United defender and Sky Sports pundit Gary Neville was critical of the statement, calling it a "mistake". The Football Association had approved the trip, with the trio arriving in London on Friday to prepare for Saturday's game.These appointments are done on an FA-to-FA request basis and there are currently no further visits to the UAE or Saudi Arabia scheduled, though this may change.Craig Pawson refereed Panathinaikos v PAOK in the Greek Super League on 3 May, while Andy Madley did two matches in Japan's J League and Japan's Kirin Cup match against El Salvador in June.
"The PGMOL believes such foreign assignments enhance the international standing of their officiating, and make the point that referees from other countries do the same." "Introducing a law change to allow a match official to change a clear error after play has restarted would be a good pace to start."
There are strict rules around what can and cannot be used when it comes to VAR, and they are controlled by the international game's rule makers Ifab. In August, Wolves had a penalty claim against Manchester United turned down by the referee and that decision was upheld by VAR, though the PGMOL later admitted this was a mistake.
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