New Zealand coach Stacey Jones has backed calls for greater scrutiny of warm-ups, as Kiwi and Samoan players reveal their heartbreak over Eliesa Katoa's head injury.

The NRL is continuing a review into Katoa's three head knocks at Eden Park, with the Tonga star still recovering in Auckland after seizure activity and a brain bleed.

The matter of most interest remains Katoa's initial head knock in the warm-up, which Tonga's medical staff did not believe required more than an on-field check.

Replays of the incident, captured by broadcasters, showed Katoa falling backwards to the ground after teammate Lehi Hopoate's shoulder struck him in the head. Loading Twitter content

The 25-year-old then suffered two further hits to his head in the game, and while he passed a HIA for the first of

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