The Cobblers will replay their FA Cup first-round tie with Rochdale after a goalless draw between the sides at Sixfields.
Dale had former Town forward Ian Henderson sent off after a quarter of an hour of the game but were still more than a match for Northampton and honours ended even at 0-0.
Chris Wilder fielded a 3-5-2 system for the game with Matt Duke restored in goal, Danny Alfei named as the right wing-back and Emile Sinclair joining Ivan Toney up front.
There was a change to the starting 11 too, with Lee Collins drafted in for Gregor Robertson after the latter suffered a back injury in the warm-up.
After delays for treatment to Matty Done and Lawson D’Ath, Rochdale had the first good chance of the game when Michael Rose let fly with a left-footed free-kick which Duke palmed away to safety.
Henderson saw red shortly afterwards - after a coming together with Ben Tozer in the technical area, he aimed a kick at the defender.
It was a nothing kick, to which Tozer did not react at all, but for which referee Kevin Johnson produced an immediate red card, to the horror of Henderson and the visiting staff.
Rochdale should have taken the lead, though, in the final five minutes of the first half.
Done had already been given offside by a marginal call and then ghosted in behind the defence before spraying a square pass across Duke and for Rose.
The forward made no contact on it and Done might have been better having a shot himself, with the goalkeeper committed and no defender nearby.
Stephen Dawson rattled the crossbar for the visitors with a first-time shot from Duke’s hurried clearance in the final minute of the first half as Rochdale sought to underline their dominance with the lead.
Darren Carter was introduced at half-time (for Alfei) and provided a bit of a spark, firing a left-footed shot narrowly wide with a deflection in the first five minutes after the restart.
Duke had to be on his toes to tip over a Oliver Lancashire header soon afterwards, although the centre-back should have done better after finding substantial room in the box.
Ivan Toney, who had a quiet game, glanced a near-post header wide after Tom Newey had created space for a left-wing cross as the game began to open up, and then planted a header straight at Logan from a deep Tozer cross, albeit one with no pace on it.
Toney should have made it third time lucky when he arrived unmarked to meet a Mohamed cross from the right wing but instead steered his effort over the bar.
Logan pulled off a superb save on the ground to deny Emile Sinclair a late headed winner and Mohamed saw a fierce cross-shot blocked by the keeper.
Ryan Cresswell - the player you would hand select to be on the end of an attacking corner late in a Cup tie - met one with perfect timing in the 90th minute but his effort was wide of the target.
There was an even later chance for Rochdale, with Ashley Eastham heading a free-kick against the post for their second strike of the woodwork in the game.
Cobblers: Duke; Tozer, Cresswell, Collins; Alfei, Murdoch, Byrom, Newey; D’Ath; Sinclair, Toney
Subs: Mohamed (for D’Ath 14), Carter (for Alfei 46), Nicholls (for Byrom 85)
Not used: Snedker, Langmead, Ravenhill
Rochdale: Logan; Bennett, Eastham, Lancashire, Tanser; Lund, Rose, Dawson; Hery Done, Henderson
Subs: Rafferty (for Hery 59), Bunney (for Rose 63), Andrew (for Bunney 90)
Not used: Lillis, Noble-Lazarus, Cannon, Camps
Away fans: 432