The Cobblers’ reward for knocking Sky Bet League One side Coventry City out of the FA Cup is a second round home tie against Northwich Victoria or Boreham Wood.
Chris Wilder’s men will face the non-League opposition at Sixfields between December 4 and 7.
Northwich Victoria play in the EvoStik Northern League Northern Division One North, and are the lowest ranked club left in the competition, while Boreham Wood ply their trade in the Vanarama National League.
The two sides drew 1-1 at Northwich on Saturday, and will replay at Boreham Wood next midweek.
Northwich are managed by former Stockport County, Peterborough United and Port Vale boss Jim Gannon, while Boreham Wood’s manager is Luke Garrard, who is the youngester manager in England’s top five divisions.
He is just 30, and the former Swindon Town and AFC Wimbledon man is registered as the player manager at the Hertfordshire club.
Brackley Town will travel to league two Barnet in the second round if they can see off Newport County in their first round replay.