Van Dyk will remain with the Ferns team as a technical advisor for the tournament, while young Magic shooter Malia Paseka has been called into the squad as van Dyk's replacement.
Fast5 Ferns coach Janine Southby said she is hugely disappointed for van Dyk.
"I think for the fans to see Irene one more time out there for New Zealand would have been really special. But she will still contribute a lot to the environment."
With the Ferns' preparation time for this weekend's tournament already limited, the late change to the team has further complicated the team's build-up. But Southby said she has been impressed with the way Paseka has slotted into the line-up after just one training session.
"The poor girl turned up at 9am and we said 'okay Malia, this is the game in a nutshull' and the younger ones have been tasked now to upskill her on the rules and that's their challenge in the next couple of hours."
There was a further scare in the New Zealand camp with captain Laura Langman missing this morning's training while she had a lower leg injury assessed by medical staff, but the dynamic midcourter has been given the all-clear to play this weekend.