"Josh is a quality footballer and welcome addition to the Gallagher Chiefs. His versatility and experience is advantageous, but more importantly, creates further depth and genuine competition for places across our backline," said McMillan.
"That brings a healthy edge to a team environment and we need that to keep fostering individual and collective growth. I know Josh is excited about challenging himself in a new environment and we look forward to him joining the Chiefs whānau in 2022."
Ioane made his provincial debut for Otago against North Harbour in 2017 and eventual Super Rugby debut for the Highlanders in 2018. In 2019 he became the first choice 10 for the Highlanders and has played 42 Super Rugby matches for the club.
Ioane made his All Blacks test debut against Tonga in Hamilton in 2019 and was recently part of the 2021 Māori All Blacks squad under Head Coach Clayton McMillan.
The newly announced Super Rugby Pacific will kick off on February 18 2022 and feature 12 teams in an 18 week season.