Luke Shaw's double fracture to his right leg in the Champions League clash with PSV Eindhoven has left Manchester United with a problem in the left-back position.
Marcos Rojo, Ashley Young and Matteo Darmian have occupied the role in wins against Southampton, Ipswich Town and Sunderland, but it appears the Red Devils are looking at alternative options.
According to the Mirror, the Old Trafford club are keeping a close eye on Charlton Athletic's 22-year-old Morgan Fox.
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The publication says United scouts have drawn up a list of potential replacements for Shaw, who is expected to be out of action until March at the earliest.
The defender, who has played in 12 of the Addicks' 13 games this season, is on the list along with West Ham's Aaron Cresswell and Charlie Taylor of Leeds United.
Charlton are reportedly keen to tie their player down to a new deal amid fears United could swoop in for him in January.
Darmian produced a fine display at Old Trafford yesterday as United swept past Sunderland with a 3-0 win.
However, the Italian international's move across the back line leaves the Red Devils short of options at right-back.
Obviously, no move for the former Wales Under-21 star could materialise until the new year, but it appears the 20-time league champions are keen to bolster their defence.
The injury to Shaw has come as a huge blow to Manchester United, as he looked back to his best form following a stop-start first year in the north-west.
Daley Blind, Darmian, Rojo and Young are all capable deputies, but none of the aforementioned players possess the same ability as the England international in the left full-back spot.
Will Luke Shaw's injury prove costly for Manchester United in their search of a first Premier League title since 2013? Have your say in the comments section below!