Diogo Dalot came off as a precaution in Manchester United's League Cup quarter-final win over Charlton.
Dalot was substituted in the 35th minute of the 3-0 victory and replaced by Aaron Wan-Bissaka but the right-back walked down the tunnel unaided.
United remain unsure about the extent of Donny van de Beek's injury that he sustained in the 3-0 win against Bournemouth a week ago.