Doctors are continuing efforts to wean Ozzy Osbourne off a ventilator following his quad bike crash.
The rocker is said to be making slow but steady progress after the accident at his Buckinghamshire mansion on Monday.
Doctors at Wexham Park Hospital in Slough, where he has been in intensive care, say it is still too early for him to breathe fully unaided.
The hospital's medical director Dr Dick Jack said Osbourne was "progressing well, but slowly".
"With each day he becomes less dependent on the ventilator," he said. "It is still too early to take him off entirely. Otherwise he is well, with no complications."
Osbourne sustained multiple injuries in the accident including a cracked vertebra in his neck, eight broken ribs and a collarbone after the bike landed on top of him.
Doctors also had to restore the circulation in one arm after the broken collarbone put pressure on a blood vessel.