Michaels, who suffered a brain haemorrhage and was then stabilised at hospital, has been in intensive care since his arrival and doctors are still in search of the source of his bleeding, according to People.
A post on Michaels's official website read: "At this point Bret remains in ICU in critical condition. He is under 24-hour doctors' care and supervision. We are hopeful that further tests will locate the source of the bleeding, which has still not been located.
"As we all know Bret is a fighter and we are hopeful that once all is complete the slurred speech, blurred vision and dizziness, etc, will be eliminated and all functions will return to normal."
The message also recognised his fans for their support since the news broke on Friday.
"Everyone at Michaels Entertainment would like to thank all fans and friends for their continued thoughts and prayers through this difficult time."
