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Ultee was briefly an amateur footballer, but at a young age was planning on becoming a sports doctor or teacher. In 2006 he started working with FC Utrecht as assistant technique trainer. In 2009, he became a part-time trainer at the club, and in 2014 became an assistant manager under Rob Alflen. After stints as assistant manager with FC Twente and Helmond, Ultee was appointed the manager of Fortuna Sittard in the Eredivisie on 13 June 2019.