#4. Winger:
The lack of a genuine winger in the squad has often left the Red Devil's handicapped... Marcus Rashford and Anthony Martial, both of whom are already converted strikers, play their best football on the left wing.
This often leaves Antonio Valencia alone to attack down the right, as either Juan Mata or Jesse Lingard play at the right wing and keep drifting inside behind the striker. Such imbalances in attack need to be fixed soon if the club is to challenge for major trophies.
Already missing out on Ivan Perisic in the summer, Mourinho will be looking to bring in a top-class player to play on the wing and with Gareth Bale largely plagued by injuries at Real Madrid, Florentino Perez will be looking to offload the Welshman next summer. Manchester United should surely be the ones to sign him up.