Wigan duo Harrison Hansen and George Carmont, Saints' Francis Meli, Salford recruit Willie Talau, Bradford's David Solomona and Leeds' Kylie Leuluai play.
Leeds loose forward Ali Lauitiiti and new Huddersfield signing David Faiumu could also be among the replacements.
Samoa, captained by Nigel Vagana, face a Tonga team buoyed by a 22-20 win over Ireland in their opening Pool C game.
Samoa: Samau, Meli, Carmont, Talau, Utai, Vagana (captain), Roberts, Leuluai, Seuseu, Tony Puletua, Solomona, Setu, Hansen.
Replacements (from): Frank Puletua, Faiumu, Paulo, Lauitiiti, Talepeau