“Further tests, specialist reviews and medical processes are still ongoing, and my doctors are continuing to assess my condition.

“On medical advice, I am not currently medically cleared to train or play at the required level, and I will be stepping away from those duties while I focus fully on my health, treatment, and rehabilitation.”

MND affects nerves in the brain and spinal cord, which tell your muscles what to do.

This leads them to weaken and stiffen over time and usually affects how you walk, talk, eat and breathe.

Scientists are not sure what causes MND, but it is likely to be a combination of the genes – or biological traits – you get from your parents when you are born, and other lifestyle factors.

Fellow former Queensland player Carl Webb died of MND at 42 in 2023, while former England rugby league half-back Rob Burrow died in 2024, five years after diagnosis.

Former Scotland rugby union international Doddie Weir died in November 2022, and World Cup-winning former England international Lewis Moody was diagnosed in September 2025.

“Thank you for the support I’ve received over what has been an incredibly difficult and uncertain period in my life,” said Arrow.

“Over recent months, my symptoms have affected different parts of my everyday life.

“I want to sincerely thank everyone at the South Sydney Rabbitohs for the personal support they have shown me and my family throughout this process.

“The South Sydney Rabbitohs, my team-mates, staff, and everyone behind the scenes have made an incredibly hard situation much easier to face.

“What I need right now isn’t sympathy or sadness. What I need is support, understanding and privacy while my family and I navigate this difficult time.

“This is only part of my story, and when the time is right, I’ll share more. But for now, I ask everyone to respect my privacy while I continue working with my doctors and my family.”

Arrow made his NRL debut in 2016 for the Broncos, before joining the Titans in 2018. He joined South Sydney in 2021, for whom he made 98 NRL appearances.

“We all know how difficult the past few months have been for Jai, but we also know that he will fight this illness with the same bravery, passion and character that was the hallmark of his playing career,” said Rabbitohs CEO Blake Solly.

“Jai and his family will always be Rabbitohs and they will be part of this club for many years to come.”