'Ikale Tahi captain Siale Piutau and loose forward Sione Kalamafoni and will call time on their international rugby careers following the final Pool C clash in Osaka.
Piutau, who will also celebrate his 34th birthday on Sunday, has played 42 tests since his debut against Fiji in 2011.
That puts the Bristol Bears midfielder in third place on Tonga's all-time list, headed by former captain Nili Latu (48 caps) and long-time fullback Vunga Lilo (44).
Kalamafoni has accumulated 36 test caps since his international debut against Korea in 2007.
