3 key takeaways for Manchester United after their capitulation against Sevilla

Tuesday night's defeat has been described as one of the worst in European history for Manchester United, after they were dumped out of the Champions League RO16 by Sevilla. The inquest into the defeat has already begun, with some calling for Alexis Sanchez to be dropped while others are pointing the finger at Jose Mourinho.

United set up negatively against the Spanish side and their lack of attacking intent and ambition infuriated the United fans, as it was bound to.

Manchester United have failed to score more than once in a Champions League tie against a Spanish side since April 2003. This unwanted run continued as in the away leg, United secured a goalless draw against a side that has shipped in five goals on five separate occasions, and have a minus goal difference in La Liga.

Wissam Ben Yedder's strikes in the 74th minute & 78th minute respectively delivered the sucker punch to the Red devils' hope of reaching the quarterfinals since Sir Alex Ferguson's retirement.

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#3 Marcus Rashford is not a right winger

Marcus Rashford struggled at right wing against Sevilla

After a man of the match display against Liverpool, Marcus Rashford was banished out to the right wing for this match - a position he has rarely thrived in. And he stayed there.

Gareth Southgate bizarrely started Rashford on the right for England against Slovakia back in September. Despite a lot of things being said about Southgate's supposed limitations as a manager, he was humble enough to rectify his mistake and pushed Rashford over to the left after he gave the ball away for Slovakia's shock opener.

The youngster responded immediately. The 20-year-old then created a goal and scored another.

Rashford has terrorized countless full-backs from the left- Liverpool's Trent Alexander-Arnold being his latest victim, as Rashford embarrassed him on Saturday with a chop-and-hit.

Despite being right-footed, and remarkably fast, Rashford just never looks all that comfortable playing on the right wing. The 20-year-old almost stutters as he approaches a one-on-one with a full-back.

But why then, is he being started on the right? The reason becomes evident as we move on to the next slide.

#2 Alexis Sanchez must be dropped

Alexis Sanchez's dismal form continued for Manchester United

The Chilean made an encouraging start to his United career and has predominantly played in his favored role on the left, but Alexis Sanchez did little to justify his place on the left - let alone in the starting line-up against Sevilla.

Sanchez lost possession 42 times against Sevilla, and as he grew frustrated he dropped deeper. This caused more problems for United going forward as it stifled the midfield players.

In the meantime, his arrival at Manchester United has forced other players out of the team or out of position. Other players - Anthony Martial, Jesse Lingard, Juan Mata - who had been playing regularly and in fine form too, have been impacted negatively by his arrival.

Sanchez may have floundered against Sevilla, but it would be a major surprise if Mourinho dropped him for the FA Cup quarter-final against Brighton. Or even moved him out of his favored role on the left.

For sure the Chilean will improve - a rare end of season break (as Chile have not qualified for the FIFA World Cup) and a full pre-season with his new team will help him - but Mourinho has already proved he has no room for an 'untouchable' culture at United, with his treatment of Paul Pogba.

He needs to follow suit with Sanchez.

#1 Mourinho needs to change his tactics

Mourinho's tactics have come under severe scrutiny

Pre-match, Manchester United legend Rio Ferdinand urged his former side to 'come out' fighting on the front foot' after Jose Mourinho's team escaped from the Ramon Sanchez Pizjuan Stadium with a 0-0 draw two weeks previously. "You don't want to pay too much respect to them, they don't deserve it, they're not good enough," proclaimed Rio Ferdinand.

The Portuguese showed the five-time Europa League winners a tremendous amount of respect in the first-leg, tasking Scott McTominay with man marking the fading Ever Banega, and Sevilla had lost two games at home, conceding seven goals in the process, coming into the second-leg.

Marouane Fellaini's inclusion in the second-leg also sent the wrong message. Naturally, United went long as a result and Fellaini's presence brought out some bad habits in his team-mates. Manchester United's muddled approach cost them, and played right into Sevilla's hands.

This negative approach is not helping him win fans over and the United faithful will ultimately want more ambition from their team. As Mourinho approached the Stretford End tunnel on Tuesday evening, he appeared to be specifically booed by sections of the home crowd.

It is a crazy thing, asking a manager as successful as Mourinho to just "change his tactics". This is what has worked for him in the past. This is what has helped him lift trophies. But the problem is - it is no longer working for him. His team hasn't yet assimilated the tactics yet into their gameplay, like his teams of the past.

Right now, it seems to be a matter of time before the accusations of negativity that ended his Chelsea and Real Madrid tenures begin to resurface.