Melbourne Storm forward Eli Katoa suffered "seizure activity" and underwent surgery overnight after a series of head clashes in Tonga's match with New Zealand on Sunday.

Katoa was allowed to play in the Pacific Championship Test despite copping a heavy knock from teammate Lehi Hopoate in the pre-game warm-up. Loading Twitter content

He then copped another high hit in the first half and passed a HIA test, before again being hit in the head in the second half.

In concerning scenes, Katoa was pictured on the sidelines receiving oxygen from medical staff while laid out on a stretcher .

The Storm said they were in touch with Tonga's Chief Medical Officer after concerns were raised about how Katoa had been allowed to play after the pre-game collision.

"Melbourne Storm forward Eli Kato

See Full Page