Centre Ryan Crotty and lock Scott Barrett have extended their contracts with the All Blacks and the Super Rugby Crusaders franchise, New Zealand Rugby (NZR) announced on Wednesday.
The statement came the day after NZR said it had agreed with prop Ofa Tu'ungafasi to extend his contract with the All Blacks and his franchise the Blues for three years.
The players are now under contract until after the World Cup in Japan from September to November next year, which New Zealand will enter as two-time defending champions.
Crotty, who is 29, and has 35 caps, had been under contract only until next summer, which gave him the option of leaving for Europe if he was not part of the World Cup squad.
Barrett is 24 and has played in 16 games. He is a younger brother of fly-half Beauden Barrett, the world player of the year in 2016 and 2017.
Tu'ungafasi is 26 and has appeared in 14 internationals.