The flanker has featured in four matches this season, and was named on the bench last weekend but wasn't injected into their clash with the Rebels.
Fakaosilea's contract was supposed to run until the end of the 2018 season, but the Brumbies agreed to release him.
He has struggled to make a consistent mark in his two seasons in Canberra, with injuries and a growing depth in the backrow limiting his chances.
