#4 Ruben Neves
Ruben Neves put in an impressive performance against United showing incredible discipline, controlling the midfield and did a good job instigating counter attacks with his quick passing.
A common theme has emerged in each of United's losses under Ole, being that Paul Pogba hasn't been at his best in these encounters. This is a blueprint for every team playing against United; if you can stop Pogba then you can stop United. When the Frenchman is not at his creative best, there is no one to play those defence-splitting passes and take the game by the scruff of the neck.
Enter Ruben Neves. Neves could help share the creative burden and bring some steel as well as silk to the United midfield. His impressive range of passing would help find Pogba in more threatening positions thus United as a team will be playing further high up the field.
The Portuguese international is also an able tackler of the ball, can play those Pogba-ish Hollywood diagonals as well as strike a ball cleanly from distance. At 21, he could be a long term solution to United's midfield problems.