 While serving as a coach Latham was forced into playing for the side in a 3–1 win over Blackburn Rovers on 2 January 1921 after two of the club's players were taken ill prior to the match, becoming the oldest debutant in the history of the club at 41.To this day he also remains their oldest ever player.Working alongside Fred Stewart, his spell at Ninian Park coincided with one of the most successful spells in the history of the club, including reaching the FA Cup final on two occasions, losing 1–0 to Sheffield United in 1925 before beating Arsenal 1–0 in 1927.