It will be a second appearance on the world's biggest stage for 30-year-old Matawalu, who followed up his contribution to Glasgow's 2015 Guinness PRO12 title win by starring for his country at the 2015 Rugby World Cup in England.
His form in a Warriors shirt this season earned him a recall to the Fijian setup ahead of the 2019 Pacific Nations Cup, having last represented the Flying Fijians in their November Test against Ireland back in 2017.
The scrum-half - who is equally comfortable playing on the wing - was named amongst the substitutes for his country's final two matches in the competition, coming off the bench in victories over both Canada and Samoa.
It will be a first World Cup appearance for summer arrival Dolokoto, who has also been heavily involved in Fiji's Pacific Nations Cup campaign over the last few weeks.
The hooker made three substitute appearances over the course of the tournament, scoring his first international try in his side’s win over Canada.
The 24-year-old is coming off the back of a season that saw him help Fijian Drua to the National Rugby Championship title in Australia - the team's first-ever success in the competition.