#2 Daley Blind
While Daley Blind has started in all of United's UEFA Champions League games this term, he has started only 3 Premier League games so far this season. With a number of defensive injuries this season, he could get more playing time.
With his contract out in the summer of 2018, Blind might move away from United for free in the summer and also secure adequate game-time at another club.
The 27-year-old at United has only been deployed in the backline as a centre-half or a left-back as Mourinho prefers specialists rather than versatile players, although it's clear he is a fan of the latter trait.
Blind's work-rate and positional awareness have been questioned off late and while he seems to be an assured figure on the ball, he could be let go by the manager in January in order to make some money off the player.