Kirby retired from playing in 1918 and moved to Spain, where he became a referee[4] and a football manager. He coached both CE Europa and FC Barcelona during the 1920s. He was appointed Europa manager in August 1922.[6] In 1923 he guided Europa to the Campionat de Catalunya. After finishing level on points with Barcelona, Europa beat them 1–0 in a title play-off. They then represented Catalonia in the Copa del Rey and after defeating Sevilla and Sporting Gijón in earlier rounds, they lost 1–0 to Athletic Bilbao in the final at Les Corts.
Kirby was subsequently appointed coach of Barcelona in December 1924, replacing Jesza Poszony.[7] His first game in charge was a 2–0 win in a friendly against First Vienna on Christmas Day 1925. He remained in charge for 39 games.
He joined Athletic Bilbao in September 1925,[8] and returned to England in May 1926.[9]