Central Midfield: Ander Herrera and Ivan Rakitic

Ander Herrera and Nemanja Matic have started to flourish under Solskjaer with a string of impressive performances. However, Matic has looked vulnerable at times and keeping the future in mind, he might be given lesser chances next season. Ander Herrera is a hard-working player who can do well on either side of the pitch. He is good at finding spaces which will complement well with United's attack.
Ivan Rakitic is a good contender to be a part of United's midfield next season as the Croatian is said to be on the lookout for a move away from Barcelona. Rakitic is good going forward with the ball and is someone who can control the midfield. Rakitic is highly talented and experienced at the highest level which could prompt United to move for him.
Attacking Midfield: Paul Pogba

Paul Pogba has been brought forward under Solskjaer as he now plays behind the main striker. Pogba has flourished in his new role and he has been involved in a number of goals.
With his versatility, the Frenchman will be a definite threat to any opponent if he settles down at this position. Going forward, the Manchester United squad would certainly revolve around him as an attacking midfielder.