When Casemiro decided to leave Manchester United during the summer, there was an understandable feeling that the time was right for both parties to move on.

The Brazilian had enjoyed an illustrious career, winning five Champions League titles with Real Madrid before arriving at Old Trafford in 2022.

But at 34, he was no longer the dominant midfielder who had helped Madrid conquer Europe.

Against the likes of Declan Rice, Moises Caicedo and Rodri, Casemiro increasingly struggled to match the athleticism, mobility and intensity required at the highest level.

United needed to rebuild their midfield with younger, more energetic players, while Casemiro had earned the right to decide the next chapter of his career.

Few would have argued that he represented the long-term solution to United’s problems.

However, the opening months of the 2026/27 season have highlighted something that perhaps wasn’t fully appreciated when he departed.

In this article, we cover lost three qualities that have become painfully absent from the current team since Casemiro left Manchester United.

1. His aerial dominance has left a huge hole at both ends

Casemiro’s goalscoring record during his final season at Manchester United was remarkable for a defensive midfielder.

He scored nine Premier League goals, eight of which came from headers.

Even more impressively, those eight headers accounted for almost half of United’s 17 goals from set-pieces during the campaign.

It was an enormous contribution, particularly for a team that often struggled to create chances from open play.

What made Casemiro so effective was his intelligence inside the penalty area.

With Harry Maguire and Benjamin Sesko presenting obvious aerial threats, opposition defenders naturally focused much of their attention on United’s two tallest attacking targets.

Casemiro exploited that attention brilliantly.

His movement, timing and ability to attack the ball allowed him to arrive in dangerous positions, often escaping markers who were preoccupied with Maguire or Sesko.

United effectively had three major aerial threats rather than two.

And Casemiro tended to be the player who would break the deadlock in a game in situations where The Red Devils were struggling to score from open play – meaning opposition teams would need to attack more in open play and that would open counter attacking opportunities for the likes of Bruno Fernandes to exploit.

This season, however, opponents have one fewer player to worry about.

They can concentrate more heavily on stopping just Maguire (with Sesko being injured for so long), making United’s attacking set-pieces considerably more one-dimensional.

But Casemiro’s departure has also affected the other penalty area.

The Brazilian was excellent at reading deliveries, attacking crosses and making important clearing headers when United were defending corners and free-kicks.

The opening-day defeat against Hull City offered a frustrating reminder of that missing presence.

United conceded goals from free-kick situations where somebody needed to take responsibility and attack the incoming ball.

Those were precisely the moments when Casemiro’s defensive instincts often made the difference.

Of course, there is no guarantee he would have prevented those goals, but United are undoubtedly missing the nous and aerial ability he provided.

2. United have lost someone who demanded professional standards

Casemiro’s final years at Manchester United were not without difficulties.

There were periods under Ruben Amorim when the Brazilian struggled for regular playing time, with questions surrounding whether he could still operate effectively within the manager’s system.

Yet his professionalism was rarely questioned.

Former United midfielder Toby Collyer previously spoke about Casemiro’s dedication, describing how he would arrive early, stay late and complete additional gym and recovery work regardless of whether he was playing.

That commitment matters at any football club, but particularly at Manchester United, where questions about effort and application have become increasingly common.

One incident against Chelsea in November 2024 perfectly illustrated the standards Casemiro expected.

After Alejandro Garnacho lost possession and failed to track back quickly enough, Casemiro sprinted across the pitch to stop Pedro Neto from launching a dangerous counterattack.

The Brazilian was forced to commit a foul and received a yellow card.

But rather than simply accepting the booking, he turned towards Garnacho and furiously demanded more effort from his younger team-mate.

The footage quickly went viral online.

It showed a player who, despite his declining physical capabilities, still understood the importance of taking responsibility and working for the team.

That is precisely the mentality Manchester United appear to be lacking this season.

Casemiro might not have been able to cover the ground he once did, but his willingness to work, compete and hold others accountable remained.

And when United’s performances are being criticised for a lack of intensity, that example becomes increasingly relevant.

3. His dressing-room leadership is proving difficult to replace

Perhaps the most underrated aspect of Casemiro’s time at Manchester United was the authority he carried within the dressing room.

This was a player who had won virtually everything available to him at club level.

He understood the demands of representing an elite football club, dealing with pressure and maintaining standards when results were disappointing.

That experience is particularly important during difficult periods and United are certainly experiencing one now.

Recent weeks have seen Lisandro Martinez publicly criticise the club’s hierarchy over its summer recruitment, while captain Bruno Fernandes has questioned the tactical approach following the humiliating UEFA Champions League defeat against Como.

Both players may have legitimate frustrations.

However, there is a difference between raising concerns internally and allowing disagreements to become public controversies.

Once those comments reach the media, they create additional pressure on the manager, fuel speculation and contribute to an increasingly negative atmosphere around the club.

Would Casemiro have prevented those incidents?

Nobody can say for certain.

But it is reasonable to suggest that someone with his experience and authority could have helped address frustrations behind closed doors before they escalated.

Leadership in football is not simply about being vocal during matches or wearing the captain’s armband.

It is about knowing when to challenge team-mates, when to support the manager and how to maintain unity when things are going wrong.

Casemiro brought those qualities through years of experience at the highest level.

United still have experienced players, but that does not mean his particular influence has been replaced.

None of this changes the reality that Manchester United needed to modernise their midfield.

Casemiro was approaching the end of his career at the highest level and his decision to move on was understandable.

United needed someone younger, quicker and capable of competing physically against the English Premier League’s best midfielders.

But replacing a footballer is not simply about finding someone who plays in the same position.

Casemiro offered an exceptional aerial threat, defensive intelligence, professional standards and dressing-room authority.

Those qualities were sometimes overlooked because the focus was understandably on his declining mobility.

And while United may eventually find a midfielder who offers more energy and athleticism, that alone will not replace everything Casemiro contributed.

The opening months of this season have made that painfully obvious.