England international flanker will reportedly leave Wasps at the end of the season but will be staying in the Gallagher Premiership.
The 28-year-old, who joined Wasps on a two-year deal in 2018, is thought to be Northampton Saints top target for next season, according to Rugby Inside Line.
Shield’s made his Super Rugby debut for the Wellington-based Hurricanes in 2012 and captained the side under current Saints boss Chris Boyd.
The back-rower was part of the New Zealand Under 20s side that retained the Junior IRB World Championship title in 2011, and was often spoken of as a future All Black.
However, after confirming his move to the Premiership in 2018, Shields was immediately selected by Eddie Jones for their summer tour of South Africa where he won his first international caps.
Shields was a consistent performer in England’s 2019 Six Nations campaign, scoring two tries in a win over Italy and was expected to be involved in their 2019 Rugby World Cup squad until an unfortunate injury in the summer saw him miss out.