Manu is of full Tongan descent and as a result is eligible both for New Zealand and Tonga. His older brother Filipe was also contracted to the Storm. He is cousin to current Super 15 Rugby union player from the Highlanders; Nasi Manu. He is also cousin to up and coming Rugby superstar David Manu, located in the Eastern Suburbs.Manu was educated at Upper Hutt College, where he played for the schools' First XV rugby team. He played for the Randwick Kingfishers, Petone Panthers and the Upper Hutt Tigers in the Wellington Rugby League. Manu was a Junior Kiwi international and was part of the 2004 side who twice defeated the England Under 18s Academy. Following this series, Manu signed a NRL contract with the Melbourne Storm.