Kyushu KV announced on Saturday that Fijian back-rower Saimoni Vunilagi had died in hospital in Fukuoka. He was 26, and he had signed for the Japanese second-division club only last month.
The club said Vunilagi fell ill after a training session on Monday 3 August, a day on which temperatures in Fukuoka reached 35C.
"After team practice on Monday, 3 August 2026, Saimoni displayed symptoms consistent with severe heatstroke," the club said in a statement. "He was transported to a medical facility for treatment, but despite the best efforts of the medical team, he sadly passed away."
He died on the morning of Friday 7 August, four days after being hospitalised.
"The players, staff, and all team associates are devastated by this sudden news," the statement continued. "Although Saimoni had only recently joined Kyushu KV, his generous spirit and powerful style of play had raised high hopes for his contributions in the upcoming season."
The club, formally Kyushu Electric Power Kyuden Voltex, asked for privacy on behalf of the family. "We humbly pray for the repose of his soul and extend our heartfelt condolences to his bereaved family," it said. "At this time of profound grief, we respectfully ask the family be granted space and privacy."
No further detail on the circumstances has been released.
Japan Rugby League One issued its own statement. "We express our heartfelt condolences upon receiving the news of the passing of Saimoni," the competition said. "We offer our deepest condolences to the bereaved family and all those involved."
Vunilagi stood 1.96m and weighed 117kg. He attended university in Japan, turned professional in 2023, and played in the top flight for Tokyo Sungoliath before dropping to Division Two with Kyushu KV this off-season. He scored against Kubota Spears at Prince Chichibu Memorial Ground in December 2023, one of the games that made his name in Japan.
Tributes came quickly from across the professional game. Former Wallabies back-rower Sean McMahon, who played alongside him in Japan, wrote "Rest in peace brother" on Instagram. Nine reported that All Blacks halfback TJ Perenara and Fiji sevens and fifteens flyer Jiuta Wainiqolo were among the other players to post condolences overnight, and that responses to the news included calls for safer training environments and for clubs to show greater respect for what the heat can do.
The context is bleak. Japan recorded its hottest summer on record last year and parts of the country have passed 40C in recent weeks. According to the fire and disaster management agency, close to 18,600 people were taken to hospital for heatstroke between 20 and 26 July alone, 45 of whom were pronounced dead on arrival. Japan sees roughly 1,300 heat-related deaths a year and has set a target of halving that by 2030. Three lions at a Tokyo zoo died of suspected heatstroke in the same week Vunilagi fell ill.
Rugby has already had one warning this southern winter. Nine reported that a South African player died of heatstroke following a training session in France in July.
The sport has been circling the issue from a distance. Australia beat Japan 35-32 in Osaka on Saturday in conditions Wallabies coach Les Kiss described as taking a lot out of his players, and SA Rugby has just locked in twelve non-contact weeks a year in part to manage player load. Neither measure speaks to a pre-season session in 35C heat at a second-division club.
Vunilagi had played one match for Kyushu KV. His new season had not started.
