#2 Marcos Rojo
Marcos Rojo was immense at the back for Manchester United in Jose Mourinho's first season in charge. He formed an incredible partnership with Phil Jones and kept things tidy at the back until he ruptured his anterior cruciate ligament.
He returned this season to face Basel in the UEFA Champions League group stage. However, since his return, Rojo has been far from impressive. In his first 5 games since his return, Rojo made merely 1 successful tackle and hasn't really come to his own.
Rojo has struggled with fitness and the last time he featured for Manchester United was as far back in February in their 2-0 home win against Huddersfield. Chris Smalling is United's no. 1 centreback right now. Eric Bailly is out with an injury but is almost certain to walk back into the first team once he regains fitness.
Phil Jones is also available and Rojo will have a tough time getting back into the thick of things at Old Trafford. He has conceded 7 goals in 6 appearances and United have been better off at the back in his absence.
With Victor Lindelof also showing signs of coming of age, it looks like quite a long road for Marcos Rojo if he is thinking of getting back into contention for a starting spot.