Crean played rugby for Leinster, Ireland and the British Isles. In 1894, he was a member of the first Ireland team to win both a Home Nations Championship and a Triple Crown. Then in 1896 he helped Ireland win their second Home Nations title. He is one of three Ireland rugby union internationals to have been awarded the Victoria Cross. The other two are Robert Johnston, who also served with the Imperial Light Horse in the Second Boer War, and Frederick Harvey who served in the First World War. Crean, Johnston and Harvey all played club rugby for Wanderers. In 1896 Crean and Johnston were also members of the same British Isles squad that toured South Africa.