#4 Marcos Rojo
Marcos Rojo joined Manchester United in 2014 for around £18m. At the time, he was highly anticipated as a result of his top-notch performances for Sporting Lisbon in LIGA Nos; but despite a fairly strong start to life at Old Trafford, he has moved further and further down the list as the seasons have passed.
Injuries have hampered much of his time with United, but so has his form. When he's played, he's often unreliable and too easily beaten by oncoming attackers. This has meant that he's been replaced by the likes of Ashley Young and Luke Shaw, rendering him a third-choice option at best.
In the summer, United need to really try and ship him out, because to have him at the club for another season is simply a waste of time. He doesn't offer anything to the squad and is frankly below par now. His time is up.