Robbie Fruean will miss the Chiefs' three match road trip after needing a heart procedure which will put the centre out of action for up to eight weeks.
The 25-year-old, who underwent his second heart surgery last year, will be having an ablation procedure for an arrhythmia and will remain in New Zealand. He faces 4-8 weeks on the sidelines.
Fruean's rugby career was temporarily curtailed in 2009, with open heart surgery required after a bout of rheumatic fever caused pancarditis, or inflammation.
Sixty-one caps for the Crusaders later, Fruean noticed early last year his cardiac function was weakening. Further surgery was needed in July and the original valve was swapped for a larger version, ruling him out of the remainder of the season.