Former Australia and Saracens fly-half Michael Lynagh is in a "stabilised condition" after suffering a stroke, according to the Queensland Rugby Union.
A QRU statement revealed that Lynagh was undergoing tests in the Royal Brisbane Hospital to discover the cause of the illness. The 48-year-old was admitted to hospital on Monday night after complaining of blurred vision and headaches following a long-haul flight from London, where he now lives.
Fellow Queensland and Australia World Cup-winning team-mate Tim Horan tweeted on Thursday morning that Lynagh was walking around. "Michael Lynagh undergoing MRI this morning. Up and walking," he wrote.
The QRU statement said: "Former Queensland Reds and Wallabies captain Michael Lynagh was hospitalised in Brisbane on Monday night after suffering a stroke.
"Mr Lynagh remains in a stabilised condition in the Royal Brisbane Hospital and is undergoing tests in an effort to discover the cause of the illness.
"The Lynagh family has requested their privacy be respected at this time. The thoughts of the entire Queensland Rugby community are with Michael and the Lynagh family."
Former Wallabies captain Andrew Slack, who wrote Lynagh's biography, told ABC Radio: "He lives in the UK now and he is back here to visit his family and just felt unwell on Monday night and headaches and various things and ended up in hospital, which I think was initially diagnosed as a stroke-type of event.
"But the doctors are still trying to work out exactly what has happened.
"Clearly he has got some issues from it, some blurred vision and stuff. But I am led to believe he got up and went to the toilet at one stage, so there's not a lot known, but he's stayed very fit since retiring some years ago and so I think she is a bolt out of the blue."
Lynagh won 72 Test caps and retired from international rugby in 1995 as the world record points scorer with 911, a total which remains an Australian record. He won the World Cup with Australia in 1991.