Gerrard, who has played 22 times for the Wallabies and 79 Super Rugby games for the Brumbies, sought the release so his young family could experience a foreign culture.
"This is my ninth season of Super Rugby and with the kids now five and three, we believe this is the right time to try our hand at living overseas," Gerrard said in a statement.
"But I'm still only 26 and after we'd had a chance to live away for a year or two, I definitely wouldn't rule out the possibility of returning to play in Australia and for the Brumbies again."
Gerrard, who last played for Australia in 2007, is third on the Brumbies' list of all-time point scorers with 306 points, behind other Wallabies Stirling Mortlock (963 points) and Joe Roff (590 points).