The former Bournemouth man saw red in the 2-0 victory at Port Vale and will now serve a three-match ban.
Fellow attacker Jimmy Keohane missed that impressive result at Vale Park through injury and he is expected to return to contention to face the Cobblers.
But manager Paul Tisdale, linked with the managerial vacancy at Swindon this week, has no fresh injury worries as they look for just their third home win since November 6.
Myles Anderson remains a long-term absentee but goalkeeper Artur Krysiak returned to action against Micky Adams' men.
Victory on Saturday would move the Grecians level on points with Northampton in the race for promotion.M