Hooker Liam Coltman, halfback Aaron Smith, centre Malakai Fekitoa and fullback Ben Smith have been named in the squad to take part in two camps later this month.
There are no real surprises in the squad, with four hookers named. Coltman and Nathan Harris of the Chiefs appear to be in a straight battle for the third hooking berth.
The camps are in Christchurch and Wellington with the first proper squad to be named at the end of this month.
Hookers: Keven Mealamu (Blues), Nathan Harris (Chiefs), Dane Coles (Hurricanes) and Liam Coltman (Highlanders).
Props: Charlie Faumuina and Tony Woodcock (Blues), Ben Franks (Hurricanes) and Wyatt Crockett and Owen Franks (Crusaders).
Locks: Patrick Tuipulotu (Blues), Brodie Retallick (Chiefs), Jeremy Thrush * (Hurricanes) and Dominic Bird and Sam Whitelock (Crusaders).
Loose forwards: Jerome Kaino and Steven Luatua (Blues), Sam Cane and Liam Messam (Chiefs), Victor Vito (Hurricanes) and Richie McCaw, Kieran Read and Luke Whitelock * (Crusaders).
Halfbacks: Tawera Kerr-Barlow (Chiefs), TJ Perenara (Hurricanes) and Aaron Smith (Highlanders).
First five-eighths: Aaron Cruden (Chiefs), Beauden Barrett (Hurricanes) and Colin Slade (Crusaders).
Midfielders: Ma'a Nonu (Blues), Conrad Smith (Hurricanes), Ryan Crotty (Crusaders) and Malakai Fekitoa (Highlanders).
Outside backs: Cory Jane and Julian Savea (Hurricanes), Israel Dagg (Crusaders) and Ben Smith (Highlanders).
