"If we get closer to May or June and they're not playing well, then yes I'll be concerned and so should they be because they're starting to run the risk of not being selected."
The All Blacks' schedule this year has them playing three June tests against Ireland in the middle of the Super Rugby competition, then the Rugby Championship (the former Tri Nations, plus newcomers Argentina), an extra Bledisloe Cup match and an end-of-year European tour where they will play Scotland, Italy, Wales and England.
The Rugby Championship will present new travel issues, with the All Blacks playing the Pumas in Argentina at the end of September and a week later playing the Springboks in Johannesburg, a schedule which is already raising eyebrows among senior New Zealand players.
Hansen conceded the new coaching and selection team of himself, Ian Foster, Aussie McLean, Mike Cron and Grant Fox faced "one or two challenges" in lifting their charges for the international programme but said he was confident the players could quickly re-set their individual and collective goals.
Among the slowest starters this season are Blues players Piri Weepu, Ma'a Nonu and Ali Williams, with Crusaders Kieran Read and Israel Dagg also out of sorts, although No8 Read has been reliable as usual on defence.
All Blacks first-five Dan Carter and prop Tony Woodcock have returned from injury and a break, respectively, with Jerome Kaino, Isaia Toeava and Colin Slade high-profile casualties for the Blues and Highlanders.
McCaw is aiming to return to the field in three weeks when the Crusaders return from their two-match trip of South Africa.
With the possible exception of Crusaders halfback Andy Ellis, the standouts have been confined to the Highlanders, Hurricanes and Chiefs. Hooker Andrew Hore and flanker Adam Thomson are performing well for the southerners, although he missed the defeat to the Brumbies with a neck injury. Hurricanes skipper Conrad Smith is playing with enthusiasm and fellow midfielders Richard Kahui and Sonny Bill Williams are shining for the Chiefs.