Samoa will miss the services of captain Piula Fa'asalele for six weeks following a broken wrist.
The 31-year-old suffered the blow during the recently concluded Pacific Nations Cup game against USA last weekend.
"We have got a few niggling injuries which hopefully they will rest and recover well," said Samoa's coach Steve Jackson .
"We will chuck every name that is available to us up on the board you know and then decide who is best to go and take the field on Saturday."
Samoa are positioned second in Pool B with a win and a defeat apiece in the two games and will host Fiji in the third round on 10th August at ANZ Stadium in Suva.