Peter Shirtliff also returns as a coach, having worked as assistant manager at the end of last season.
Ex-Sheffield United chief scout Lee Turnbull also joins the backroom staff.
The Latics continue to search for a manager to replace John Sheridan after he left for Notts County.
Steve Evans, most recently of Leeds United, rejected the offer to manage Oldham despite agreeing personal terms.
Oldham Athletic have added former Bournemouth and Nottingham Forest manager Sean O'Driscoll to the coaching staff and given him a role in helping the board appoint a new manager.