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John Mark Eustace (born 3 November 1979) is an English professional football coach and former player who is currently head coach of EFL Championship club Derby County. During his playing career, he played as a central midfielder for Coventry City, Stoke City, Watford and Derby County. He also spent time on loan at Dundee United, Middlesbrough and Hereford United. After retiring as a player, Eustace served as manager of Kidderminster Harriers between 2016 and 2018, eventually leaving to become assistant manager of Queens Park Rangers in 2018. He had a brief spell as caretaker manager at QPR in 2019.