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In my opinion, the midfield is the central point where the strength of the team will be created. When defending or attacking, the midfield is the link between the lines. When their midfield can control the field, then the pressure on the team will decrease. From several teams that I have seen, sometimes the midfield is the determinant of the team's success.
The presence of Casemiro certainly makes Manchester United midfield stronger, Casemiro experience and ability as one of the best midfielders in the world coupled with his consistent performances on the field can help stop the flow of the ball that leads to the Manchester United defense.
Although Casemiro is not the type of midfielder who is prolific in contributing goals and assists, his role is very important for Manchester United in holding the ball as the first bull when there is an attack from the opposing team.
Casemiro can build the confidence of Manchester United defenders, when there are players who work hard against the opponent's attack, other players will also be motivated to give their best contribution.
Casemiro will be Manchester United fourth signing this summer, as Manchester United had previously managed to secure the services of Tyrell Malacia, Eriksen and Lisandro Martinez.