Jurgen Klopp was shocked as referee Paul Tierney blew early for half-time, regardless of Sadio Mane being via on objective towards Manchester United.
Fourth official Craig Pawson gave a minute of extra time with the rating goalless at Anfield on Sunday.
Nonetheless, Tierney blew up just a few seconds early when Liverpool ahead Mane seemed set to be in a one-on-one with United goalkeeper David de Gea.
Liverpool boss Jurgen Klopp seemed shocked on the sidelines, whereas Thiago Alcantara put his arms on his head.
Reds legend Graeme Souness was dismayed by Tierney’s resolution.
He informed Sky Sports activities: “He blows early, when it’s laid again right here, watch, he’s blown.
“Whenever you say ‘anticipated to play a minimum of one minute extra, is {that a} rule? Is {that a} legislation?
“He’s blowing early. Barely irritating for Liverpool, as a result of he [Mane] was in.”
Replying to Souness, former Man City defender Micah Richards mentioned: “It’s positively controversial, however I feel you’re clutching at straws there.”
Liverpool trailed league leaders Manchester United by three factors heading into the sport.
Purple Devils midfielder Bruno Fernandes had the first-half’s greatest likelihood when his free-kick sailed inches broad of Alisson’s objective.
Alisson denied Fernandes and Paul Pogba late on within the second-half to protect a goalless draw for the hosts.
