On July 7, 2015, Ellerby signed his first contract abroad, agreeing to a one-year deal with Barys Astana of the Kontinental Hockey League.

[5] After 42 games with the Kazakh-based club, Ellerby sought a release and immediately signed with Swiss team HC Fribourg-Gottéron of the National League A on January 4, 2016, for the remainder of the 2015–16 season.

[6] Ellerby proved to be a solid addition to Lukko's blueline, contributing steady defensive play to go along with 3 goals and 12 points in 43 games.

[8] As a free agent midway into the 2019–20 season, Ellerby continued his professional career signing in the neighbouring Austrian Hockey League with the Dornbirn Bulldogs on November 18, 2019.

[12] Upon retirement from playing in 2022, Ellerby was named an assistant coach of Western Hockey League (WHL) side Prince Albert Raiders.