He was a member of the legendary Original All Blacks tour in 1905-06 on which he played 25 of the 35 matches including his first Test cap for New Zealand on 18 November against Scotland. In total he played 30 matches during the period of 1905 to 1908 including eight Tests.
After switching to rugby league Gillett toured Australia with the 1911 New Zealand national team and was one of four New Zealanders who toured Britain with the 1911-12 Australasian team. He played in five tour matches but no Tests. Gillet coached the 1912 New Zealand tour of Australia.Coffey, John and Bernie Wood Auckland, 100 years of rugby league, 1909-2009, 2009. ISBN 9781869693664.