With Money's resignation in April 2008, Mullen stepped in as caretaker manager before being appointed full-time a month later.
During his playing career Mullen represented Sheffield Wednesday and Rotherham and got his first coaching job as assistant manager to Ian Porterfield at Aberdeen in 1986.
Mullen took charge of Blackpool in 1989 before moving to Fourth Division Burnley where he guided the Clarets to two promotions.
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