As an unsigned free agent over the summer, Austin received a second successive tryout invitation to attend the Columbus Blue Jackets training camp.

[12] He was later released and returned with the Monsters to train before later leaving at the beginning of the 2018–19 season, agreeing to a professional try-out deal with the Stockton Heat, affiliate to the Calgary Flames on October 11, 2018.

[13] After appearing in two games, Austin was released from his tryout opting to embark on a European career in agreeing to a one-year contract with Danish club, Esbjerg Energy of the Metal Ligaen on December 2, 2018.

[14] After one season in the Czech Extraliga with Rytíři Kladno, Austin opted to extend his career abroad, agreeing to a one-year contract as a free agent with Russian club, Torpedo Nizhny Novgorod of the Kontinental Hockey League (KHL), on May 18, 2020.

[15] Having claimed the Finnish Liiga championship with Tappara in the 2021–22 season, Austin continued his journeyman European career in signing a one-year contract with German club, Kölner Haie of the DEL, on July 5, 2022.