Kettering Town coach Roger Ashby is to stay at the club and work alongside new manager Morell Maison and first team coach Nicky Eaden.
Maison had said there was "definitely" a role for Ashby, who was assistant manager to former boss Marcus Law.
Ashby told BBC Radio Northampton: "It's a club I enjoyed being at as a player and assisting Marcus, so I was only too pleased Morell wanted me on board.
Ashby's 662 appearances (in which he scored 96 goals) is a Poppies record.
Ashby added: "I've been to several clubs as manager, and being assistant was far less stressful, so I'm quite happy to be an assistant here and I'll do what I can for the team."