Northland lock Josh Goodhue will join the Blues next year.
The 21-year-old, who stands 2m and 116kg, played for the New Zealand Under-17 team in 2012 and was part of the successful New Zealand Under-20 side that won the World Cup last year.
Goodhue hails from Kawakawa, where he turned out for the local United Kawakawa club before he and his twin brother Jack moved to Mount Albert Grammar in Auckland.
The twins were both selected for the New Zealand Under-20s, with Jack now playing for Canterbury and attending Lincoln University.
Blues coach Tana Umaga said the selection of Josh Goodhue is another signal that the organisation is clearly identifying its young prospects and working hard to retain them in the region.