The 26-year-old is expecting a tough opening game this afternoon and hoping for a winning start.
"The boys are ready," he said after the captain's run at Bidesi Park in Laucala Bay, Suva.
"We have worked hard on our set-piece - the line-out and scrum. We know Japan teams are very good in those areas and breakdown areas, the rucks and mauls."
The Tongan backs and forwards trained separately yesterday.
"I think we have practised well. But it will be a hard game for us," head coach Isi Fatani said.
