Junior Japan head coach Satoru Endo said they are confident that their young players can do the job when they face the Samoans.
"Basically, most of them are third year and fourth year of university students.
"Half of them are under-20s," he said.
According to Endo, Tuesday's team run was the first they had together as a team.
Fiji Times reports despite their lack of time together, the Japanese team seems to be in high spirits and beaming with confidence as seen during their training session at the Bidesi Grounds in Suva, yesterday.