Vuna signed with the New Zealand Warriors and made his first grade debut late in 2004, in Round 24 against the Parramatta Eels.

[4] In Round 24, 2010 Vuna scored 4 tries against the Brisbane Broncos equalling the Newcastle Knights' club record for most tries in a game.

[11][12][13][14] He played the Rebels' pre-season trials against Tonga and Fiji; against the Crusaders he ran on with former Wallabies Stirling Mortlock and Julian Huxley.

In May 2013, it was announced that Vuna would leave the Rebels at the end of the season to join Japanese Top League club Toshiba Brave Lupus.

[20][21][22] He joins head coach Damien Hill and fellow Rebels players James O'Connor, Gareth Delve, Ged Robinson, Nick Phipps, Nic Henderson, James King, Tim Davidson and Richard Kingi on the list of departing Rebels at the end of 2013.

His last game as a Rebels player was a home game against New Zealand franchise the Highlanders, a match that also turned out to be the last Rebels match for head coach Damien Hill and players James O'Connor, Gareth Delve, Ged Robinson, Nick Phipps and Nic Henderson.

[23][24] On 2 March 2015, Vuna travelled to England to join Worcester Warriors in the Premiership Rugby with immediate effect from the 2015–16 season.