Winger Demontagnac became the fourth Cobblers player to see red in the club's first seven games of the new season when he was given his marching orders during Tuesday's Johnstone's Paint Trophy defeat at MK Dons. He now starts a three-match suspension.
Striker O'Donovan, meanwhile, returns from a one-game ban having sat out at stadiummk following his late dimissal at Bristol Rovers last weekend.
Boss Aidy Boothroyd is also hopeful of left-back Joe Widdowson (hamstring) and midfielder Ian Morris (groin) returning to the fold.
- Sports & Recreation
- Aidy Boothroyd