Career
After displaying good form during the 2009 pre-season, he was elevated to Fremantle"s senior list as a nominated rookie, along with Greg Broughton. de Boer made his American Federation of Labor-Congress debut for Fremantle in Round 6 of the 2009 American Federation of Labor-Congress season at Subiaco Oval in the Western Derby against the West Coast Eagles, as a replacement for the injured Rhys Palmer.