Diogo Dalot was absent from first-team training on Tuesday ahead of Manchester United's match against Burnley.
Dalot returned to Carrington on Friday, which was earlier than expected, after exiting the World Cup at the quarter-final stage with Portugal, but he appeared to sustain an injury in that last appearance at Qatar and he didn't train ahead of Burnley.
Aaron Wan-Bissaka, Brandon Williams and Tyrell Malacia trained with the main group and they are Erik ten Hag's options at right-back for the match. Victor Lindelof can also play in that position but he's expected to start in the centre of defence.