Lewis Ludlow, who captained England in the win over Canada, faces a possible ban after being cited for kneeing an opposition player in the head.
Ludlow was sent to the sin-bin during Saturday's 70-14 victory for striking Canada's Jake Ilnicki in a ruck.
The Gloucester flanker, 26, will attend a disciplinary hearing on Thursday at 19:00 BST.
The World Rugby website states the low-end sanction for striking with the knee is four weeks or matches.