“So how much she's going to come back and when, I don't know and I'm not going to guess," Crosby added.
His revelation confirms reports that the 71-year-old singer suffered a brain aneurysm when she was found unconcious in her Los Angeles home in March.
She reportedly regained consciousness on the way to the hospital, and statements on her official Twitter account later said she was "awake and in good spirits."
Mitchell’s longtime friend Leslie Morris was appointed as Mitchell’s conservator by a Los Angeles court to help make medical decisions while she recovers.
Crosby, 73, has been the first one to speak out about the “Both Sides Now” singer’s condition since her official website posted an update in April.