The former Heart of Midlothian and Inter Milan midfielder signed a two-year contract in July but featured in only 11 games due to a combination of injury and suspension before falling out of favour when Glenn Roeder replaced Peter Grant, the man who signed him.
Brellier, nicknamed Le Juge in Scotland because of his fearsome reputation (which failed to show itself in England except for a couple of very poorly timed tackles), becomes the third of Grant's signings to leave the club in a couple of days, following Chris Brown's move to Preston and David Strihavka's release this morning.