He was educated at Prince Edward School, Harare before transferring to Brighton College via a sports academic scholarship.
Born and raised in Zimbabwe, Manyika first picked up a rugby ball aged 12 influenced by his older brother who had recently tried the sport.
He excelled immensely in a short space of time later leading to him being spotted and scouted by Brighton College Sports Master, Richard Halsall.
[2] Having joined as an academy Pro months before, on 17 August 2008 Manyika was named on the replacements bench for the team to face Manu Samoa as part of their World Cup preparations at the Twickenham Stoop.
Manyika made his first international appearance representing Zimbabwe U19 at the 2007 Under 19 Rugby World Championship in Belfast, Northern Ireland.