United have taken just four points from their first four matches of the campaign and were also dumped out of the Carabao Cup by Grimsby Town. It means there is fresh pressure on Amorim to keep his job at Old Trafford, though he currently retains the backing of the United board after he was given £225 million to strengthen his squad in the summer transfer window.
United's hierarchy have no desire to sack their head coach so early into the season, but they might have to change their minds if results don't improve over the coming weeks. Erik ten Hag was sacked in October last year after he had also been backed with a £200m transfer haul in the summer window.
Jim Ratcliffe will hope history doesn't repeat itself, but if they were to make a managerial change, here is a look at nine of the most realistic options they could go for.
Manchester United head coach Ruben Amorim is under fresh pressure
1. Manchester United head coach Ruben Amorim is under fresh pressure
Manchester United head coach Ruben Amorim is under fresh pressure | Manchester World
Glasner has done an excellent job at Crystal Palace and is proven in the Premier League. He could be ready for the next step in his own managerial career.
2. Oliver Glasner
Glasner has done an excellent job at Crystal Palace and is proven in the Premier League. He could be ready for the next step in his own managerial career. | Getty Images
Iraola has done a good job at Bournemouth and is another option with a proven track record in the Premier League. He would find it hard to turn down a club like United.
3. Andoni Iraola
Iraola has done a good job at Bournemouth and is another option with a proven track record in the Premier League. He would find it hard to turn down a club like United. | Getty Images
Southgate might not be a popular choice among United supporters, but he has plenty of admirers within Ineos and could be viewed as a safe pair of hands.
4. Gareth Southgate
Southgate might not be a popular choice among United supporters, but he has plenty of admirers within Ineos and could be viewed as a safe pair of hands. | Getty Images