Nock's role in helping the world-beating Saint Kentigern's team remain unbeaten for nearly three years - in which they won the national schools title, the Auckland 1A competition title and the Sanix World Rugby Youth Tournament in 2013 - made him standout as a must-have selection for the New Zealand Schools side.
His key role for New Zealand Schools during wins against Fiji and Australia cemented attention from Super Rugby selectors nationwide.
"It's really exciting to be part of the Blues and I've been really impressed with the environment, since I've been involved, and learned a lot already," Nock said. "All the staff and players have welcomed me into the group and I can't wait until next season."
Blues high-performance manager Tony Hanks said Nock was ready for Super Rugby.
"He joins a group of young players who we have identified as possessing the skills and, most importantly, the attitude and aptitude to be successful in the professional rugby scene for the Blues.
"The Blues are working hard with our provincial unions and with schools on identifying talent and Sam most certainly fits into that category as both a very talented player and future leader."
