Both sides are yet to register a win.
The Pukpuks lost to Fiji 63-0 in round 1 and then 55-16 to Tonga on Tuesday this week in round 2.
Vanuatu have suffered bigger losses, going down 81-0 to Tonga and then 109-6 to host Fiji.
The game will kick off at 12.30pm (9:30pm PNG time).
The final of the 2015 Oceania Rugby Junior Trophy will be between Fiji and Tonga. It will be played tomorrow at 5pm.
The winner between Fiji and Tonga will also book a spot in the 2016 World Rugby Junior Trophy tournament.
Photo credit: Oceania Rugby