Cobblers will come up against former manager Keith Curle in League Two next season after he signed a new two-year deal as head coach of Oldham Athletic.
The 57-year-old had initially signed a contract until the end of the season at Boundary Park following his departure from Northampton, but he now has the role on a more permanent basis.
Curle won four of his 14 games in charge as Oldham finished 18th in League Two.
Curle said: "From the moment I walked into the football club I knew I wanted to stay.
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"It's taken a bit of time to sort out because for me to do my job properly going forwards I wanted to get an understanding of exactly what is required, the expectations and what I'm responsible for.
"I'm confident I can make a positive difference and give this club the platform to be successful. The hard work continues now and I'm really looking forward to seeing the supporters back at games soon."
Latics owner Abdallah Lemsagam added; "We are really pleased that Keith has agreed to join the club on a new deal. Apart from his obvious vast experience and success in the lower leagues, all the Directors and staff have been really impressed by his desire to help unite the club so we can all push forwards together."