Gillett joined the Newton Rangers in the Auckland rugby league competition. He played for them in 1911 and 1912. After switching to rugby league Gillett toured Australia with the 1911 New Zealand national team playing in 7 matches. Prior to the tour he played for New Zealand against Auckland and scored a try. He was one of four New Zealanders who toured Britain with the 1911–12 Australasian team. He only played in four of the 35 tour matches and but no Tests. Gillett coached the 1912 New Zealand side who played the touring New South Wales team. Remarkably he did not play a single game of club rugby league or a single game for Auckland.