Pierce has a mild concussion but could be cleared to play.
If he doesn't, Joey Elliott will take the snaps and both men were on the field for practice Wednesday.
Offensive co-ordinator Gary Crowton says he's preparing game plans for both but he's hoping Pierce is ready to play.
Pierce has said he feels fine but he has to pass a test before he's allowed to return.
He was injured by a helmet to the chin in Saturday's 29-10 loss to the Toronto Argonauts.