Former Ryder Cup captain Bernard Gallacher is in a "critical" condition in hospital.
Gallacher is being treated in Aberdeen Royal Infirmary, NHS Grampian has confirmed.
It could not confirm any other details about the 64-year-old's condition.
George O'Grady, chief executive of the European Tour, said: "We are in touch with Bernard's wife Lesley and the Gallacher family and, obviously, we join with everyone in wishing Bernard a speedy recovery."
His nephew Stephen, who pulled out of the ISPS Handa Wales Open during his second round on Friday morning due to a back injury, said: "I understand that he is critical but stable. My family is in disarray at the moment and it is obviously a worrying situation. We are all anxious."
Gallacher turned professional in 1967 and was named the Sir Henry Cotton rookie of the year the following season.
In 1969 he became the youngest winner of the prestigious PGA Championship at 20 years and 97 days, a record which stood until earlier this year when Italian Matteo Manassero triumphed at Wentworth aged 20 years and 37 days.
Gallacher made the first of his eight Ryder Cup appearances as a player in 1969, defeating Lee Trevino 4&3 in the singles at Birkdale in a contest which famously ended in a 16-16 draw after Jack Nicklaus sportingly conceded a putt to Tony Jacklin on the 18th green of the final match.
The next seven contests all ended in defeat, the last coming by a single point at Palm Beach Gardens in Florida in 1983 (team photo above, Gallacher fifth from right), the first time Jacklin captained the European side.
Gallacher went on to captain Europe in 1991, 1993 and 1995. The first two contests ended in narrow defeats - the first in the controversial 'War on the Shore' at Kiawah Island - before a memorable one-point win at Oak Hill.
That victory was sealed by Philip Walton's win over Jay Haas on the 18th green of the penultimate singles match, with Walton still holding on to his putter as Gallacher hoisted him into the air in jubilation.