Charlie Ngatai's on-going concussion issue has seen George Moala called into All Blacks camp this week.

Ngatai was concussed against the Highlanders on May 7 and missed games against the Hurricanes and Waratahs.

The Chiefs second five-eighth is yet to fully recover from the knock, placing him in doubt for the first test against Wales on June 11.

STEFAN GOSATTI/GETTY IMAGES George Moala has been called into the All Blacks squad as cover.

Blues utility Moala, who made his test debut in Samoa last year, will remain with the All Blacks squad until Ngatai recovers.

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"Charlie has still got symptoms so we made a decision after he came in on Sunday to send him home," All Blacks assistant coach Ian Foster said. "We feel that's the best place to chill out for the next three or four days. We're reviewing that on a daily basis.

"It's one of those things you've got to give people time and space and when it comes right it comes right. We don't know a definite time table to recover properly so it's probably best to get out of the busyness of here and be at home."

Foster gave little away about Sam Whitelock's recovery from a hamstring complaint that kept him out of the Crusaders win over the Blues but Tawera Kerr-Barlow's broken hand is expected to keep him out of the first test.

"Sam is progressing to plan at this point and Tawera's hand is much the same. He's due to start some passing work with that hand at the end of this week."