Ganly made his debut for Ireland shortly after leaving school at the age of 17 in August 1921 against Scotland in a first-class match. He was bowled for a duck in the only Irish innings. He returned to the Ireland side in June 1923, again playing against Scotland in a first-class match, also playing against Wales. In 1924, he played for Ireland a fourth time, again against Wales and also played his only first-class match for Dublin University in June against Northamptonshire. He became a more regular fixture in the Irish team from 1925. That year he played against Scotland, the MCC at Lord's Cricket Ground and Wales. He scored 62 not out in the second innings of the match against Scotland, his highest first-class score. The following year, he played against the same three teams, and the match against the MCC in Dublin was his most successful for Ireland, scoring 83 in the first innings and 68 in the second, his top two scores in all matches for Ireland. He continued as a regular in the Irish team between 1927 and 1930, playing against Scotland, the MCC, and the West Indies, amongst other opponents. He captained Ireland against the West Indies in 1928, a match which Ireland won. It remains their only victory against a Test nation in a first-class match, though they have beaten the West Indies twice since in one-day matches. A match against Julien Cahn's XI in 1930 would be his last for four years. He returned to the Ireland side in August 1934, playing against the MCC in a first-class match before spending a further three years out of the Ireland side. His last two matches for Ireland were two against New Zealandin September 1937, the first of which was his final first-class match.
Statistics
In all matches for Ireland, Ganly scored 831 runs at an average of 19.79, with a top score of 83 against the MCC in August 1926. He took nine wickets at an average of 26.56, with best bowling figures of 2/22 against Scotland in July 1927. He captained Ireland eight times.
Ganly first played for the Ireland national rugby union team in the Five Nations in 1927. He played in all four games, scoring two tries against Wales and one against Scotland. Later that year, he played in a friendly match against Australia, scoring a penalty. In the 1928 Five Nations, Ganly again played in all four games and scored two tries against France, one against Scotland and one against Wales. He played against France and Scotland in the 1929 championship, and against France in 1930, but did not score in any of those games. He finished his Rugby Union career with a record of seven tries and one penalty from a total of twelve games.
