Hackett came off with a knock after 63 minutes of the Cobblers' surprise 2-0 home defeat to struggling York on Saturday.
The midfielder did not train on Monday but boss Aidy Boothroyd said Hackett will do some light training on Tuesday and will be involved in some capacity later that evening.
Should Hackett have to settle for a place on the bench, either Luke Guttridge or Lewis Hornby will come into the starting XI.
Striker Clive Platt is still hampered by a back problem but managed the final quarter of an hour as a substitute against York, and Boothroyd says he will continue to "treat him with kid gloves".
Captain Kelvin Langmead remains on the sidelines with a knee injury but the defender may come back into the reckoning when Northampton travel to Port Vale at the weekend.
- Sports & Recreation
- Aidy Boothroyd