Among the full caps travelling to Romania in a squad that contains 14 players from Edinburgh and nine from Lineen's Glasgow side is Ospreys winger Nikki Walker.
Christian Roberts left Sporting Chance on Thursday and was back training with the squad on Friday before travelling to Bradford for a game on Saturday.
In the run-up to the first game the Nigerians had been training in Durban - which is not a high-altitude venue - before travelling to Johannesburg on Friday, giving the squad only one day to acclimatise to the conditions.