Sellar was educated at Brighton Secondary School along with other AFL draftees Bryce Gibbs and Mark Austin.
At 196 cm and weighing 95 kg, Sellar is a key position forward who can also help out with some ruck duties.
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.
[4] In 2014, he moved to Western Australia to play for South Fremantle in the West Australian Football League (WAFL).