 He became Canada's assistant coach in the early 2000s and interim manager in 2003–04.Miller was a youth soccer coach with the Abbotsford Soccer Association in the Fraser Valley in British Columbia, specifically the Abbotsford Rangers USL Premier Development League side, until 2007.On 3 July 2007, it was announced that Colin Miller was hired as assistant first-team coach of Derby County, an English club playing the 2007-08 season in the Premier League.