Australian flyer Josh Mansour is set to miss the remainder of the Four Nations and the start of the 2017 NRL season of tearing his ACL in a training mishap.

Mansour had been in sparkling form running for almost 250 metres in the Kangaroos big win over Scotland.

The Penrith favourite collided with Josh Dugan in a game of touch footy at Australia’s training base.

“It’s obviously shattering news for Josh,” coach Mal Meninga said.

“He has been a popular member of the squad and was excellent for us against Scotland last Friday.”