Coles last took to the field early in November of last year and has been working through knee and calf injuries throughout 2018.
"His knee has been the major problem, but he had a calf strain there a while back so we've just got to make sure we get the running into that so it doesn't go again," Hansen said.
Coles missed the entirety of the Hurricanes Super Rugby season due to the injuries, and speaking to the Herald in May, the 31-year-old was hopeful to return during the Mitre 10 Cup season for Wellington.
Coles was one of a handful of All Blacks who will remain in New Zealand when the side travel to Argentina tonight, alongside fellow injured trio Brodie Retallick, Liam Squire and Joe Moody, while Kieran Read was left behind for rest purposes.
Wellington loose forward Vaea Fifita was called into the squad to replace Read on the back of some dynamic appearances at the provincial level.
All Blacks travelling squad
Forwards
Liam Coltman, Nathan Harris, Codie Taylor, Owen Franks, Tim Perry, Angus Ta'avao, Karl Tu'inukuafe, Ofa Tuungafasi, Scott Barrett, Patrick Tuipulotu, Sam Whitelock, Sam Cane, Vaea Fifita (Argentina test), Shannon Frizell, Jackson Hemopo, Kieran Read (South Africa test), Ardie Savea, Luke Whitelock.
Backs
TJ Perenara, Aaron Smith, Te Toiroa Tahuriorangi, Beauden Barrett, Damian McKenzie, Richie Mo'unga, Ryan Crotty, Jack Goodhue, Anton Lienert-Brown, Sonny Bill Williams, Jordie Barrett, Rieko Ioane, Nehe Milner-Skudder, Waisake Naholo, Ben Smith.