New Zealand hooker Dane Coles faces a race against time to be fit to start the British and Irish Lions Test series due to ongoing concussion problems.

Coles has not played since suffering a head issue in March, and is now a doubt to be ready for the Hurricanes' Super Rugby clash with the Chiefs on Friday, 9 June.

The All Blacks will kick off the three-Test series against the Lions at Auckland's Eden Park on 24 June.

Free-running hooker Coles numbers among New Zealand's top talents, and would prove a sore miss to Steve Hansen's back-to-back world champions should he be unavailable to face the Lions.

"I think it would be unlikely he's going to get through enough (work) before next week for him to come into contention for selection," Hurricanes coach Chris Boyd told reporters, of Coles' chances of facing the Chiefs.

"I might be surprised when I get home (from Australia where the Hurricanes will face Western Force), but the indications are at this stage that probably not."

Number eight Kieran Read now hopes to be ready in time for the Lions series after nursing a broken thumb, but will still have to prove his fitness closer to the Tests.

The All Blacks will host Samoa in a warm-up match on 17June, before moving on to face the Lions, who have still just won one tour to New Zealand, back in 1971.