Keven Mealamu won't be seen in Super Rugby until late March, and has relinquished the Blues' captaincy.
The All Blacks hooker will take up an option to have several weeks extra leave at the start of the season, and will play his first game against the Waratahs in round five.
His manager Tim Castle says it's been a very trying 2012.
"It's been an enormous year and this is a slightly refined version of a sabbatical to enable Keven to just to step back from the intensity of the game mentally and freshen up."
Mealamu has asked coach Sir John Kirwan not to consider him as captain, as the leader should be with the side from the start of the season.