Michael Clarke Duncan has been moved to "the best cardiologist" after going into cardiac arrest.

The Green Mile actor is believed to have been discovered by his girlfriend Omarosa Stallworth at around 2 am Friday morning.

She performed CPR on location and managed to revive the 54-year-old.

The star was then transported to a nearby hospital where he was immediately admitted to the intensive care unit (ICU) for treatment.

Michael is reportedly recuperating well albeit slowly.

"Michael is being moved to Cedars Sinai Medical Center," a source.

"He is strong enough to be moved and the best cardiologist is at Cedars."

He is said to be heavily medicated and his loved ones are still worried about him.

"Michael has remained sedated so that he's not too excitable," the source revealed.

"He has so much life and he's improving so much but everyone around him is still very frightened about his condition."