Raiders medical staff believe head trauma caused Harawira-Naera's collapse during the NRL match against South Sydney, testing throughout the week finding two previous head knocks he'd taken shortly before his seizure could be the main reason.
Coach Ricky Stuart wouldn't speculate on a potential return date for Harawira-Naera on Thursday, although he expected the 28-year-old would get into some "light training" next week.
It might prove an emotional boost for Raider players, who looked distraught watching their teammate receiving medical attention last Saturday night.