Haretuku, in his first world championship campaign, has drawn the short straw to make way for Nukunuku.
"Rhys' injury has changed the dynamic of our team and we were forced to make a difficult decision that would cost someone their place through no fault of their own," Kohlhase explained.
"Jerome has worked hard for his chance, and we certainly cannot fault his dedication and contribution to the team. I know he's disappointed, but I also know he's young enough to help us win world titles for a while to come."
The Black Sox spent last week in a remote Northland location and have now re-assembled for the world championship in Auckland. They are scheduled to play the Czech Republic in a warm-up game at Simpson Park Penrose today.
Hawke's Bay's Regan Manley has been named as the standby pitcher for the side in the wake of Wellingtonian Karl Gollan's decision to return to the United States for work commitments. Should any of the Black Sox pitchers be injured before Thursday and be forced to withdraw from the championships Manley will replace them.