The 32-year-old McCaw was included in a preliminary 30-man training squad on Monday for a two-day camp in Auckland this week as the All Blacks build up to their first match in the southern hemisphere competition against Australia in Sydney on August 17.
McCaw took a six-month sabbatical from all rugby until June 30. He has played only one match of lower-level club rugby and made two cameo appearances off the bench for his Super Rugby side the Canterbury Crusaders since his return to the field.
Local media reported on Monday he had experienced some soreness in his neck after he played 13 minutes for the Crusaders in their tense 20-19 semi-final loss to the Waikato Chiefs on Saturday.
That soreness meant he was only likely to play again in the All Blacks' training games against the Wellington and Canterbury provincial teams in Wellington on August 9, the New Zealand Herald reported.
Tighthead prop Charlie Faumuina was also brought back into the training squad after he missed most of the Super Rugby season and the All Blacks June Tests against France with a calf injury.
None of the Waikato Chiefs players were included in the squad as they prepare to host the Super Rugby final against the ACT Brumbies on Saturday in Hamilton.
Coach Steve Hansen is to name his final squad on Sunday for the Rugby Championship against the Wallabies, South Africa and Argentina.
Chiefs players Aaron Cruden, Tawera Kerr-Barlow, Liam Messam, Sam Cane, Brodie Retallick and Ben Afeaki all played against France and are expected to be included in that squad.
All Blacks squad:
Backs - Israel Dagg, Charles Piutau, Julian Savea, Ben Smith, Ma'a Nonu, Rene Ranger, Francis Saili, Conrad Smith, Beauden Barrett, Daniel Carter, TJ Perenara, Aaron Smith, Piri Weepu
Forwards - Steven Luatua, Richie McCaw, Kieran Read, Brad Shields, Matt Todd, Victor Vito, Luke Romano, Jeremy Thrush, Samuel Whitelock, Wyatt Crockett, Charlie Faumuina, Ben Franks, Owen Franks, Tony Woodcock, Dane Coles, Andrew Hore, Keven Mealamu