Everton winger Jack Grealish received a yellow card from referee Darren England on Saturday for protesting to the match officials.
The incident occurred after Liverpool's 2-1 victory in the Merseyside derby at Anfield. Ryan Gravenberch and Hugo Ekitike handed Arne Slot's side a commanding 2-0 advantage within the opening 45 minutes following a superb showing from the Reds.
However, David Moyes' Everton players found their rhythm as the Premier League match progressed, with Grealish and Iliman Ndiaye causing problems down both wings. The pair combined brilliantly to set up Idrissa Gueye's strike for Everton just shy of the hour mark, setting up a tense finale.
The Toffees pressed hard for an equalizer, but Liverpool stood firm to preserve its perfect start to the Premier League campaign.
When the final whistle sounded, cameras captured Grealish in heated discussions with the officials, while Toffees manager Moyes was also voicing his displeasure following the loss.
While the exact nature of the Everton pair's complaints are unclear, co-commentator Ally McCoist offered his thoughts. Speaking on TNT Sports, McCoist remarked: "He's very unhappy, David.
"I'm not sure what he's unhappy about, but I think when he goes back and has a cup of tea, he'll be proud of his boys."
The former Rangers star added: "I thought that there'd be slightly more stoppage time. I really did."
Everton's goalkeeper, Jordan Pickford, had to intervene and steer Grealish away from the match officials at Anfield to prevent further repercussions, while fellow commentator Darren Fletcher noted: "Jack Grealish has just been shown a yellow card by Darren England after the final whistle and David Moyes wants to have words as well, with the officials.
"It's Liverpool's day. Ryan Gravenberch with a goal and an assist. David Moyes not happy, but Liverpool stay perfect in the Premier League."
In his post-match interview, Grealish shed light on his altercation with the referee, telling broadcaster TNT Sports: "It was a bit frustrating really, they were trying to slow the game down - I've never seen anyone in my life get booked for taking a quick free-kick.
"I don't know where that rule came in. Even stoppage time, three minutes and one minute? Like, come on. I've never seen that in the Premier League.
"I get sometimes you want to let the game go, but you can't let something go then one of their defenders goes down and give it, I get it.
"You come to these stadiums, with the crowd on you, I feels like they have to give it. Kiernan [Dewsbury-Hall] on four yellows and he gets a yellow today for taking a quick free-kick, we want to get the game going, we're losing the game. I've never seen or heard that in my life."