4. Eric Bailly
One of the players that could easily be used to define the instability is Eric Bailly. The 26 year old Ivory Coast defender have had games that he was a beast at the back and others that he was a nightmare for him. He stood out as one of the best performer of the night when United hosted Arsenal in the league earlier in the season. He has however been unable to cement a starting shirt under caretaker manager, Ole Gunnar Solksjaer. He will definitely not be a first choice in a make or break game like this.