Manchester United suffered one of the worst days in Premier League history when they were beaten 5-0 at Old Trafford by Liverpool.
Many home fans fled at half-time, after the Red Devils conceded four goals in the first 45 minutes.
Ole Gunnar Solskjaer described his loss as his darkest day as Manchester United manager but promised to continue despite the pressure that such a result would place on him.
Chris Sutton, a former striker for Norwich and Chelsea, stated on BBC Radio 5 Live that Solskjaer must go. Gary Neville, ex-captain of Manchester United and Sky Sports pundit, believes there will be "untold" pressure on the Norwegian if Neville stays.
Solskjaer can or should survive Sunday's capitulation.
You have the tools, but you are not delivering?
Solskjaer is Manchester United's manager since 2018. However, he has yet to win any trophy since his appointment at Old Trafford.
They have enjoyed some remarkable highs, such as their 27-game unbeaten run away record, but also significant lows.
Sunday's heavy loss came just over one year after they were defeated 6-1 by Tottenham. However, this loss against one of their most fierce rivals will likely cause more pain for United fans.
Solskjaer had a good summer with the addition of players such as Raphael Varane, France's defender, and Cristiano Ronaldo, Portugal's forward - but Sutton believes he could have done more.
Sutton stated that Ole Gunnar Solskjaer was not given all the weapons for this season.
"We have stood up for Solskjaer but he's been there almost three years and with the signings made at the beginning of the season, you thought they had to challenge for the title. But I don't see any other way.
"He must go, surely?"
Neville said that Manchester United is at rock bottom, and the manner in which the defeat was handled was particularly worrying.
He said, "This is as bad as it gets." He said, "We've all lost matches in bad ways, Sir Alex Ferguson lost 6-1 to Manchester City, and I lost 5-0 to Newcastle. It happens, but that is part of the performance. They are now in the red.
"The pressure that will follow this game is going be unbearable. Everyone has been made aware by the board that they stand behind him in all times of trouble and are strong in their support. This is very sad. It's been a horrible nine games, forget about this one, eight of them were poor.
"Manchester United's players will be demoralized and the next 24hrs will be hot for them. It's going be hard for them to stay together.
Dion Dublin, a former Manchester United striker, says that the club's hierarchy will need to make some tough decisions.
On BBC Radio 5 Live, he said: "Do they continue to work with Ole?" Let's see what the cards say. Are they going to keep Ole? They have to make a decision, especially with Ole being a United legend. But it is not easy. It's not right at Manchester United at the moment.
It is going to be difficult for him. It's the result. Five goals at home against your largest rival is embarrassing. I don't know what he will say or what the hierarchy will say. But I do know what the fans will think.
John Murray, BBC Radio 5 live commentator believes that the club's board will be tested.
He said, "Results can change everything." This could be a turning point in the direction of the team. This is a true test of Manchester United's determination that what they are doing is right.
"This result will only provoke a conversation at top club about Ole Gunnar Solskjaer being the right man for the job they want."
This season, Man United won Total Premier League rank Tackles with 61 20th Errors leading shots 8 =20th Clean Sheets 1 =18 Goals conceded 15 =16
What went wrong?
Manchester United seemed out of control from the beginning, their defense particularly poor as they left players unmarked, and created spaces at the back which Liverpool exploited in devastating fashion.
Ian Wright, a former striker for England and Arsenal, said to BBC Match of the Day2 that Liverpool are miles ahead of England and England. It all comes down to how they are coached. It's chalk and cheese. It is everywhere, according to Manchester United.
"Watch Man Utd play and think about how the coaching team can set them up so that they will be able to play on the front foot against a Liverpool side without structure. They should be better at coaching this team than they are.
Micah Richards, an ex-defender for Manchester City, claimed that there is "no organization" in the Manchester United team.
Match of the Day2 was told by him: "Man Utd has some great players, but they are a group of individuals.
"I have always supported Solskjaer, because I believe he has done an outstanding job in bringing that feeling-good factor to the league. But now he is being scrutinized because the squad is as good or better than anyone else in the league. If they aren't performing we must criticise them.
"There is no team cohesion. It will be hard for Ole, but it is necessary that we give him the opportunity to prove his worth."
Manchester United has made the most tackles in the Premier League this year (104) and Neville stated that he didn't see any team that showed the same commitment or desire during a match as their opponent.
He said: "They get outrun. They are one of lowest running teams in league and easy-to-play against. That's a poor reflection upon manager, staff, and players.
They don't have a structure from which to press, they don’t run as hard and are easy to beat. They were dismantled by Liverpool.
Manchester United has a difficult run of fixtures ahead
Liverpool's worst home loss - United's unwelcome landmarks
Manchester United lost at Old Trafford by five goals or more, without scoring for the first time since February 1955 when they were defeated 5-0 at Manchester City under Matt Busby.
Manchester United lost this fixture by a greater margin in October 1895, when Liverpool defeated them 7-1 at Anfield. In 1925, they were also beaten 5-0 at Anfield.
Manchester United's largest loss in this fixture is at home.
Manchester United was trailing 4-0 at halftime, the first time they have ever been trailed by four goals in a Premier League match.
"United is about to be hit with a tsunami negative publicity"
Simon Stone, BBC Sport:
Old Trafford has been consistently described by Ole Gunnar Solskjaer as Manchester United "hitting a brick wall".
The club's hierarchy believes that the direction he is leading the club is right. They won't let outside noise influence them. They will continue to follow the process until the end.
All this is great, but United is about to get a tsunami of negative press.
Solskjaer will be questioned as never before. His coaching staff, some of which are on the verge of signing new contracts, will be ridiculed. His players will also be criticised.
It happened with David Moyes, Louis van Gaal and Jose Mourinho at least once before their tenures were eventually brought to an earlier-than-hoped-for conclusion.
Everyone connected to United knows that there is no way to predict when the storm will pass. Not with Manchester City facing in two weeks and Chelsea on 28 Nov.