The rugby world has been rocked by news former All Black Carl Hayman has early on set dementia at age 41.
All Blacks assistant coach John Plumtree says New Zealand and World Rugby are doing all they can to minimise the risk of head injuries.
Hayman - who was an All Black prop - told The Bounce sports newsletter he's been struggling with head related issues since retiring six years ago.
Felicity Reid reports.
