Former Ryder Cup captain Bernard Gallacher remains in a "critical" condition ahead of a fourth night in Aberdeen Royal Infirmary.
The 64-year-old Scot is being treated for what is understood to be a heart problem after being taken ill on Thursday evening.
NHS Grampian said no further update on Gallacher's condition would be given until 10am on Monday.
Renton Laidlaw, the veteran broadcaster and journalist who has known Gallacher for more than 50 years, told BBC Radio Scotland's Golf Show on Sunday: "I was up at Aberdeen yesterday. He is obviously in a critical condition and he is sedated but he has had a quiet night.
"I think he is a fit person, he doesn't drink, he keeps himself fit, he doesn't smoke and hopefully he will make a good recovery.
"We don't know just what brain damage there might be but we are keeping our fingers crossed that it's not too bad."
Gallacher made the first of his eight Ryder Cup appearances as a player in 1969, the same year he became the youngest winner of the 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.
He went on to win 10 European Tour titles but is perhaps best known for his role as Ryder Cup captain in 1991, 1993 and 1995.
Current captain Paul McGinley, who is currently competing in the Wales Open, said on Saturday: "I'm thinking about him like everyone else and hoping he will pull through. He is a guy I know pretty well, he lives near me in Sunningdale and I have played golf with him many times.
"I've spoken to him about the Ryder Cup captaincy and he is a mine of information. He was captain three times and between him and Tony Jacklin they have more experience than anyone. My thoughts are with him and the family."
Colin Montgomerie, who made his Ryder Cup debut under Gallacher in 1991 and also played in 1993 and 1995, added: "I can't comment too much because I don't know too many details about the situation.
"All we can do, as everybody will, is wish him well. Our thoughts go out to him and his family and let's hope he makes a speedy recovery."
Ireland's Philip Walton, who holed the winning putt at Oak Hill in 1995 after Europe had suffered narrow defeats in 1991 and 1993, added: "I just want to wish them all well to be honest with you.
"He's a man I've known for a long time and one I have a lot of respect for so I hope everything is well for him. It's very sudden and a difficult situation so hopefully they can do something for him."