Cobblers injury latest: Andy Williams, James Olayinka and Alan McCormack
Striker Andy Williams has been sent for a scan after suffering a hamstring injury against Walsall on Saturday.
The 33-year-old, who has eight goals this season, pulled up with just 17 minutes played at the Bescot Stadium and had to be replaced by Matty Warburton.
"Andy Williams has been sent for a scan today (Tuesday) and we'll find out the exact extent of that," said manager Keith Curle.
"He's a quick healer and he doesn't get many muscular injuries and that's down to how he conditions himself and how he looks after himself, but we'll find out the details of it with the scan results."
Cobblers have no Tuesday fixture for the first time in over a month this week and that should allow extra time for injured players to build up their fitness.
Midfielders Alan McCormack and James Olayinka are creeping ever closer to a first-team return but Harry Smith and Shaun McWilliams remain out for the foreseeable future.
"This should be Macca's first full week of training so we'll find out how he responds," added Curle.
"James Olayinka came back with a spring in his step - not a limp! - and that was pleasing.
"He's coming up again this week and he's having extensive treatment and rehabilitation at Arsenal and he's also seeing us through the week so he's getting looked after."