Born in New Zealand, he represents Tonga at international level after qualifying on ancestry grounds.

A Bay Roskill Vikings and Richmond Rovers junior, Lousi was educated at St Paul's College in Auckland.

[3][4] He spent the 2012 season playing for the Auckland Vulcans in the NSW Cup before making his National Rugby League debut in round 20 as a last minute replacement for Steve Rapira, who suffered an injury in pre-match warm ups.

[5] Lousi signed with the NSW Waratahs for the 2015 season but, after gaining four caps, he suffered a shoulder injury which ended his Super Rugby campaign.

[2] He joined the New South Wales Country Eagles team in the National Rugby Championship for the 2015 season.