Liverpool manager Jurgen Klopp called for clarity on offside decisions and VAR after Roberto Firmino was harshly denied a goal against Aston Villa.
Premier League leaders Liverpool came from behind to win 2-1 at Villa Park on Saturday thanks to last-gasp headers from Andy Robertson and Sadio Mane, cancelling out Trezeguet's first-half opener.
It was a triumph which maintained Liverpool's six-point lead over titleholders Manchester City atop the table, while also extending their unbeaten run in the Premier League to 28 matches.
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However, Klopp's side may not have needed to rely on late drama had Firmino's goal been allowed to stand shortly after Villa took the lead.