Australia hero Michael Lynagh is in a stable condition in hospital after suffering a stroke, according to the rugby union.
A statement from Queensland Rugby Union revealed that the former Saracens fly-half was undergoing tests in the Royal Brisbane Hospital to try to find out the cause of the problem.
"Former Queensland Reds and Wallabies captain Michael Lynagh was hospitalised in Brisbane on Monday night after suffering a stroke," the statement read.
"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 48-year-old was admitted to hospital on Monday night after complaining of blurred vision and headaches following a long-haul flight from London to Brisbane.