The audio recordings of discussions between the match officials around Luis Diaz's disallowed goal against Tottenham have been made public.
Liverpool asked the Premier League for the audio after the controversy in the first half of Saturday's 2-1 defeat.
Video assistant referee Darren England did not overrule when Liverpool's Diaz was wrongly flagged offside.
In the audio, England says the check is "perfect" before swearing when he realises a mistake has been made.
A statement from referees' body PGMOL said: "In a lapse of concentration and loss of focus in that moment, the VAR lost sight of the on field decision and he incorrectly communicated "check complete", therefore inadvertently confirming the on-field decision.