Musician Colin Vearncombe, known as Black, will need "a miracle" if he is to pull out of a coma after a car accident in Ireland, his management has said.
The singer from Liverpool, who had a global hit in 1987 with Wonderful Life, suffered swelling on his brain after sustaining a serious head injury in a crash on Sunday January 10 near Cork Airport.
The 53-year-old has been in intensive care since.
In an online update on his condition, the singer's management said Black's wife Camilla and three sons, who have been at his bedside since the accident, were hoping people would send positive healing and energy to him.
"Scans have revealed that the injuries to his brain are worse than we feared and that he has only a slim chance of pulling through," they said.
"He is in a stable condition, which is being managed by the amazing staff of the intensive treatment unit, with his family by his side.
"More scans are scheduled for Friday morning, however it is clear that if we are going to see an improvement, we will need a miracle.
"Colin's wife Camilla has asked that anyone who wants to, to send collective healing and positive energy to Colin particularly between 12pm and 2pm today, in the hope of the miracle we need. If you miss this time, no matter - your thoughts are still very welcome."
The family also asked for messages of support to be emailed to email@example.com.
"We would ask that the family are given space to deal with these difficult times in private," the management said.
Black is due to become a grandfather on St Patrick's Day with the expected birth of his eldest son's child.
The crash occurred as he drove on his own from his home in Schull, west Cork, to catch a flight from Cork to Edinburgh for a songwriting trip.
Hundreds of fans have written messages of support on the musician's website.
Best known for 1980s singles Sweetest Smile and Wonderful Life, Black has released 15 albums under his own name and also published poetry and staged exhibitions of his paintings in Ireland, where he has lived for more than 10 years.