Wingers
Alexis Sanchez
Since his arrival, Alexis Sanchez has failed to live up to his billing by virtue of his underwhelming performances for the Red Devils, registering a total of just two goals and three assists in 12 outings. All the same, the Chile international will try to bring his A-game having relished a prolonged holiday due to his country's absence in the World Cup.
In case he fails to perform, Anthony Martial (if he stays) and Jesse Lingard will be waiting in the wings.
Marcus Rashford/Ivan Perisic/Gareth Bale
While Manchester United's left flank is is over-saturated with heavyweights, the right wing does not boast of any prominent name.
In consequence, United have been linked with a host of right-wingers with Gareth Bale and Ivan Perisic surfacing as top targets. And if a deal is clinched with either of the two, the said player will be a regular in the starting XI.
Otherwise, Mourinho will presumably slot Rashford into the right wing.