[2] In 2016 he played for New York Athletic Club RFC in the American Rugby Premiership, before joining Denver Stampede for the inaugural PRO Rugby season, Turnbull played in all 12 of the Stampedes matches in the season with the Colorado-based side winning the competition.
[5] On the May 28 2022 in a win over San Diego Legion, Turbull became the 18th player to reach 50 MLR caps, he also scored two tries in the 44–28 victory.
[6] On June 7 due to breaches of the salary cap rules, Major League Rugby, the Austin Gilgronis from the playoffs.
[7] He joined the newly formed Anthem Rugby Carolina in 2024 captaining them in their first ever game, a 46–13 loss against the New England Free Jacks.
[10] He earned his first start in the final of the La Vila International Rugby Cup, beating Spain 12–42.