Michael Carrick, Jonny Evans and Rafael da Silva were all absent from Manchester United's training session earlier today.
The latter two of that trio limped off at half time during United's 3-1 victory away at Fulham on Saturday afternoon, while Carrick failed to to feature because of a calf complaint.
Their omission from today's session has resulted in reports that they may now miss tomorrow night's Champions League tie against Real Sociedad.
However, Danny Welbeck, who has suffered with a knee problem of late, was present and could now be included for the trip to Spain.
Tom Cleverley also trained despite having been substituted at Craven Cottage with double vision.
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