Manchester United are in somewhat of a delicate position as they prepare for the second-half of a testing season.
There is still no real idea of just how well teams will cope following the involvement of key players at the World Cup, meaning sides could err on the side of caution rather than rushing their best players back.
This is a particular problem for United, given that they are overly reliant on a core group of players and don't have the most suitable options in reserve to replace them.