He spent most of his early AFL career playing for Glenelg in the South Australian National Football League (SANFL), playing only a handful of games for the Crows despite being named as an emergency on numerous occasions. With injuries to Brad Moran and Jonathon Griffin in mid-2009, Sellar found his way at last into the regular side in the unlikely role of a backup ruckman to Ivan Maric.
He spent most of his early AFL career playing for Glenelg in the South Australian National Football League (SANFL), but only played a few games for the Crows despite being named as an emergency on many occasions. When injuries to Brad Moran and Jonathon Griffin occurred in mid-2009, Sellar finally got into the regular team as a backup ruckman to Ivan Maric.