The defender will serve the first of a three-match ban after he was sent off for violent conduct during last weekend's 1-0 defeat to Bradford.
Reading loanee Angus MacDonald will come into the starting line-up in place of Saah, while captain Lee Mansell comes back into contention after serving a three-match ban.
Striker Rene Howe is battling to recover from a knee injury and will be given a late fitness test.
Meanwhile midfielder Billy Bodin is rated at 50/50 to play some part in the game after picking up a knock on his ankle last week.
Torquay currently sit 11th in the league, two places above Saturday's opponents.