Jazmin Hotham and Montessa Tairakena of Waikato and Mahina Paul of Bay of Plenty have finished their schooling and moved to the High Performance Sevens centre in Mt Maunganui as part of the 21-strong Black Ferns Sevens squad for 2019.
Coach Allan Bunting said the three teenagers had already impressed.
"They are three players with massive potential.
"We are looking towards Tokyo [2020 Olympics] at the moment, but these are the sorts of players that can look towards the 2024 Olympics and beyond.
