Manchester United manager Ruben Amorim acknowledged the dire state of the club's domestic season following a disappointing 4-3 defeat at Brentford on Sunday, conceding that significant change is on the horizon at Old Trafford.

Amorim, who arrived from Sporting Lisbon in November to replace the sacked Erik ten Hag, has struggled to turn the tide for the Red Devils, securing only six wins in his 24 Premier League matches in charge.

Once hailed as one of Europe's most promising young coaches during his tenure at Sporting, Amorim is now facing mounting pressure in Manchester. The team's 12th league defeat under his leadership has plunged them to a lowly 15th place in the Premier League table.

With the threat of their lowest league finish since their relegation in the 1973-74 season looming large, only success in the Europa League appears capable of salvaging what has been a turbulent campaign.

Regardless of their European journey, which saw them secure a commanding 3-0 victory over Athletic Bilbao in the first leg of their semi-final on Thursday, Amorim is acutely aware that Manchester United cannot sustain their current Premier League malaise. The club has not lifted the English league title since 2013, while rivals Liverpool equaled their record of 20 English championships last weekend.

"It was a reflection of our season," Amorim somberly stated regarding their lacklustre performance at Brentford. "The players have to understand we cannot do this anymore. We know the context of the season and we need to change that."

The defeat in the 35th round of the Premier League marked the Portuguese coach's 12th league loss, adding to his six wins and six draws, resulting in a concerning 40% success rate in the domestic tournament.

This underwhelming record has drawn significant criticism from Manchester United supporters on social media platform Fanatics, with many expressing their frustration with the team's inconsistent performances in the league. One user described it as the "worst of all time."

Another fan commented on Amorim's future, stating, "If we finish 17th and don’t win the Europa League, he’ll have to be sacked. I don’t want him to be, but he can’t keep his job after doing this."

One particularly concerned supporter drew parallels with the previous manager's situation, warning, "(Erik) ten Hag all over again! He's going to win the Europa League to cover the cracks."

The stark contrast between the team's disjointed displays in the Premier League and their more cohesive performances in the Europa League has left many fans perplexed and deeply worried. "What is wrong with this team?! How do they play in the Premier League and how do they play in the Europa League?!", questioned one exasperated Football Fanatic following the Brentford defeat.