Tonga coach Kristian Woolf named a 25-man squad ahead of the June 25 Test, with Tupou named on the wing and Staggs at five-eighth - despite the pair playing for the Blues in last week's opening Origin match.
Manly second-rower Haumole Olakau’atu and Cronulla centre Siosifa Talakai, who have both been mentioned as contenders to join the NSW squad for Origin II in Perth on June 26, have also been included along with the likes of Jason Taumalolo, Addin Fonua-Blake and Tevita Pangai jnr.
Under international eligibility rules, players can play for both their state and Tonga.