Luis Diaz scored a goal from Mohamed Salah in the 34th minute of Tottenham’s game against Liverpool on Saturday. Diaz raced past Tottenham goalkeeper Guglielmo Vicario and scored, only to be flagged offside by the home officials.

Replays appeared to show that Diaz (centre, below) was on the line with the follow-up left foot of Christian Romero.

To the surprise of many, including the television broadcasts of the match, VAR lines – that is, lines on the field to indicate whether a player is offside or off when the ball is played – were not given for replays.

The goal didn’t stop and Liverpool lost the game 2-1, with Curtis Jones and Diogo Jota both sent off.

Shortly after the match, PGMOL, the body responsible for match officials in the English professional game, said there had been “serious human error” and that VAR should not have intervened in the decision and the goal should have been awarded. The lines were drawn and they followed the procedure but the ‘check complete’ signal was given to the officials at Tottenham instead of a recommendation for interference and a goal being awarded.

PGMOL has promised a full review of the incident. Darren England was on VAR duty for the match.