Former Sunderland midfielder Rae played alongide Ince at Wolves before working as part of his backroom team at MK Dons and Notts County.
The 43-year-old ex-Dundee player manager had been working with the Dons as a chief scout and joins Steve Thompson in assisting Ince, who lost his first game at the helm against Leeds on Wednesday night.
Ince told BBC Radio Lancashire: "He's got a vast amount of knowledge, which he can lend to the players and the rest of the staff.
"He's now part of the team alongside Thommo."
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