Austin signed a deal to play in Denmark with a team called the Esbjerg Energy on Sunday, TSN reports.
Austin did not receive a qualifying offer from the Sabres and will be an unrestricted free agent on July 1.
Austin was returned to AHL Rochester on Thursday.
Austin was recalled from AHL Rochester on Saturday.
Austin was scoreless with three shots on goal while posting a hit and a minor penalty in Monday's 2-1 win against the Red Wings.
Austin was recalled Monday from AHL Rochester.
Austin was sent to AHL Rochester on Thursday.
Buffalo has agreed to terms with Brady Austin on a three-year, entry-level contract.
He produced nine goals and 24 assists in 67 games with the Belleville Bulls and the London Knights of the OHL this past campaign. The Sabres took him in the seventh round (193rd overall) of the 2012 NHL Entry Draft