First five-eighth Simon Mannix was lost to New Zealand rugby at the age 25 when he moved to further his rugby career in the UK. Earmarked for higher honours at an early age, Mannix was picked for the All Blacks tour of France in his first year out of school in 1990. He played four matches on that tour and another four on the 1991 tour of Argentina as an understudy to Grant Fox. He was left out of the All Blacks 1991 World Cup Squad and also in 1992 and 1993, before being recalled to play his one and only test in 1994 against France. Mannix also played for the New Zealand XV in 1991 and the New Zealand Development XV in 1992-1993.
Mannix was also a loyal servant of the Wellington Lions, playing 83 matches and scoring 648 points for Wellington between 1990-1996. In 1996, Mannix left to see out his career overseas, most notably with Gloucester.