Liverpool avoided a first Premier League defeat of the season on Saturday as they came from behind to beat newly promoted Aston Villa 2-1 at Villa Park.
While the visitors dominated possession in the first half, it was Villa who took the lead, with Trezeguet meeting a John McGinn cross at the back post on 21 minutes.
A VAR check for offside saw the goal stand and there was more VAR misery for Klopp and his players minutes later.
Roberto Firmino found the net for Liverpool, but was denied the equaliser as VAR reinforced the linesman’s decision to raise his flag.
Liverpool, whose Trent Alexander-Arnold was making his 100th appearance for the club, had their chances to equalise throughout the second half, but were wasteful as Mohamed Salah, Firmino and Adam Lallana all missed from promising positions.
The visitors finally struck with three minutes remaining, however, as left-back Andy Robertson forced a header past Tom Heaton after Sadio Mane’s cross.
Mane produced again in added time to give his team all three points, stooping to head in Alexander-Arnold’s corner.
The Reds stayed top of the table on 31 points with the result, while second-placed Manchester City similarly came from behind to beat Southampton 2-1 with a late winner.