All Blacks loose foward Luke Jacobsen has been ruled out of the Rugby World Cup before the tournament has even kicked off.
Jacobson has suffered delayed concussion following the test against Tonga last weekend.
The All Blacks coach Steve Hansen said the 22-year-old had not presented with any signs of concussion after the test but had developed symptoms after the first training session in Japan this week.
"After discussing this latest episode with Luke, as well as our medical team, the decision has been made to, sadly, withdraw him from the turnament," said Hansen.
Jacobson was understandably upset.
"I'm gutted...however I completely understand that this decision has been made with my health and best interests at heart.
"Whilst I'm feeling 98 percent okay, I know I'm still not quite right and by taking a break now, I'll give myself the opportunity to continue my career in the future."
Hansen said "while it was a tough conversation to have, ultimately it was a very simple decision. We have a duty of care to look after our players."
Jacobson will stay with the side until he is symptom-free and ready to fly home.
Tasman loose forward Shannon Frizell has been called into the side and will arrive in Japan on Saturday.
Loose forwards Vaea Fifita and Dalton Papalii weren't considered for selection because they are currently injured.