Winger Hackett missed last weekend's 1-0 victory over Accrington as he served a one-match suspension while striker O'Donovan has been sidelined since mid-October having undergone a hernia operation.
But the Cobblers are without influential loanees Izale McLeod, who featured for MK Dons in the first round of the competition, and Stuart Dallas, who has been denied permission to play by parent club Brentford.
- Sports & Recreation
- Izale McLeod
- Stuart Dallas