Anthony Taylor showed Jurgen Klopp a red card in the dying embers of Liverpool 's enthralling 1-0 win against Manchester City.
But it wasn't the first time that the Reds boss has been unhappy with that particular Premier League official. Klopp was dismissed in the 85th minute on Sunday when his star, Mohamed Salah, went down under a challenge from City midfielder Bernardo Silva, as most of Anfield expected a foul to be given.
Taylor waved play on, though, then proceeded to blow his whistle to stop a Citizens attack because he'd spotted the Liverpool manager's intense outburst at the linesman who was only a few yards away from the incident and chose not to raise his flag.
Klopp saw red and furiously marched down the Anfield tunnel, dismayed at the decision. But the German's feelings are nothing new, having previously questioned Taylor's competence following their memorable 5-0 victory over Manchester United last season.
According to the Athletic, Klopp felt that the Altrincham-born official was soft on United, despite Paul Pogba receiving a red card. The Frenchman lunged in on Naby Keita early in the second half before heading for for an early bath, but Liverpool felt that their player was also on the end of another dangerous challenge.
Fred had committed a high tackle on Keita, and that was only one of multiple decisions which Klopp felt Taylor got wrong. The Reds thought that Cristiano Ronaldo should've been sent off for his challenge on Curtis Jones which prompted a scuffle between both sets of players.
Jones was again the alleged victim, at least from Liverpool's point of view, when Bruno Fernandes made a rash tackle on him. Finally, Klopp and co believed that Harry Maguire deserved to be given his marching orders when he collided with Diogo Jota on what was a chaotic afternoon at Old Trafford.
Klopp also confronted Taylor early in his tenure as Liverpool manager, publicly criticising the referee for a soft free-kick leading to a Sunderland equaliser in a draw back in 2017.
“It is tough for me to accept," Klopp complained at the time. "If there’s no free-kick then there’s no handball. And there was no foul for the free-kick. I saw it again and there was no contact.”
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Despite their history, Klopp offered an apology to Taylor's linesman in his post-match press conference after being sent off against City, admitting: "It is about emotion of course so red card, my fault, I went over the top in the moment. I know myself, I am 55 and I deserve a red card. I lost it in that moment and it is not okay.
"A little bit as an excuse I would like to mention - how on Earth can you miss that foul, how is it possible? You cannot have this situation. It is the clearest foul I ever saw in front of the linesman and he is not bothered."
City boss Pep Guardiola was in agreement with Klopp that Taylor and his team of officials had an erroneous day on Merseyside. The Citizens thought they'd broken the deadlock through Phil Foden, but a foul in the build-up from Erling Haaland saw the goal ruled out after a controversial VAR check.
Guardiola has suggested that there was a bias towards Liverpool in the game, telling Sky Sports : "The referee came to the coaches and said play on, play on. There were a million fouls. But after we scored a goal, he decided it is not play on. This is Anfield."
Elaborating on what was said by Taylor to both benches, the City manager told BBC Match of the Day: "The referee says play on, play on, play on, how many thousand million fouls he has almost given? But the goal was not given.
