His father, Sireli Matavesi, toured the United Kingdom as a Fiji Barbarian in 1987 where he met his wife, Karen.
Josh represented Mounts Bay before joining the Exeter Chiefs set up. He then moved to Racing Metro before joining the Worcester Warriors ahead of the 2012-13 season.
It's an interesting rugby path to date, even more so when you consider that he was courted by both the England and Fijian U20 set ups before opting to commit his international future to Fiji.
But it's his knowledge of the English club game has seen the Fiji coaches lean on him heavily over the past week or so.
"They've put of lot of responsibility on me and Akapusi (Qera) in the meetings. We've both played club rugby over here so they've asked us for our input on the English style of play etc.
"We've been involved a lot this week in establishing the game and that's been a great experience for me as one of the younger players."
The game against England at Twickenham is a massive opening game for the Fijians.
However, Matavesi admitted that he's looking forward to the game on Tuesday evening at Kingsholm, just down the road from where he plays his club rugby.
"I can't wait to go down to Kingsholm and have a game in front of the Shed. This will be the first time I've played against a proper Gloucester side.
"I did play A League for the Chiefs there a couple of years ago, but I don't think the Shed was open that night. So, I'm looking forward to the experience.
"I hope some of the Worcester supporters come down to give us some support. There's myself and Ravai Fatiaki in the squad and we'd love to see some familiar faces down there cheering us on.
"They love their rugby so I'm sure some of them will make their way down - they'd be very welcome!"
So, who should the Gloucester crowd be looking out for on the night?
"Keep an eye out for the number ten, Jonetani Ralulu. He's got plenty of tricks.
"And some of the locks run faster than some of the backs - it's not very good when we're playing touch rugby and they skin us!
"They're very big and very quick. You have to be careful when they're running at you!"