All Blacks rookie Luke Jacobson has been ruled out of the Rugby World Cup with ongoing concussion symptoms.
The 22-year-old loose forward had no signs of concussion during the test win against Tonga last Saturday, but developed symptoms after the All Blacks first training session in Japan this week.
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"After discussing this latest episode with Luke, as well as our medical team, the decision has been made to, sadly, withdraw him from the tournament," said coach Steve Hansen.
"We all felt the best thing for him to do is to take a break from rugby, until he is symptom-free and ready to return to rugby.
"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 and Luke's health is the most important thing above anything else."
Jacobson is "gutted" to miss the tournament, but knows his health must come first.
"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," he said.
"I wish the team all the very best and will be with them all the way."
He will stay with the group, until he is ready to fly home.
Tasman loose forward Shannon Frizell will join the squad before their first World Cup match against South Africa on September 21.
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