The former Australia and Saracens fly-half Michael Lynagh is being treated at the Royal Brisbane and Women's Hospital after suffering a stroke, according to reports in Australia.
The 48-year-old, who won the World Cup with Australia in 1991, fell ill while visiting Brisbane. His family have asked that the hospital release no details over his condition although he is believed to be suffering impaired vision to his right eye.
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.
An inspirational playmaker, Lynagh made his Test debut in 1984 and he was part of Australia's Grand Slam-winning team later that year. He was also vice-captain of Australia's World Cup-winning side in 1991.
After captaining Australia to the quarter-finals of the 1995 World Cup, Lynagh retired from international rugby and joined Saracens at the start of the professional era. Lynagh was the club's first major signing after Nigel Wray had taken over and he helped attract Philippe Sella, Francois Pienaar and Kyran Bracken to the club.