"We can't thank everyone enough for all the well wishes and prayers being sent Bret's way," his management team writes in a new statement posted on Michaels's Web site Sunday evening. "Please remember Bret is, and always has been, a fighter and survivor and is under the best medical care possible."
The post also promises an update as soon as doctors find the cause of the bleeding in Michaels's brain.
"As of now Bret remains in ICU under 24 hour surveillance," the statement reads. "Further testing this week will help locate the source of the bleeding. Look for an official medical report from doctors this week here at BretMichaels.com."
Before he was transported to the undisclosed hospital, Michaels, 47, was suffering a massive headache, which he likened to "[getting] hit in the head with a baseball bat over and over again." According to a source close to the situation: "He still has the headache and is heavily sedated."