‘Exhausted’ Boxing Legend Muhammad Ali Readmitted To ICU — ‘Wasn’t Responding’

It’s been just one week since Muhammad Ali was released from a long hospital stay, but RadarOnline.com has learned exclusively that he’s back in the ICU.

According to a source, guests at his Scottsdale, Arizona, home called 911 in the early hours of Thursday morning.

“He wasn’t responding,” said the source. “He went to bed Tuesday night, but didn’t wake up in the afternoon or evening the next day. He was sleeping for 24 hours.”

The source close to the family added that by the time emergency services were alerted, the heavyweight champ, who suffers from Parkinson’s disease, had been asleep for well over a day.

“They thought he might be too exhausted,” continued the source.

The sports icon, who celebrates his 73rd birthday on Saturday, is currently in the intensive care unit at an undisclosed Scottsdale-area hospital, where he’s being closely monitored.

“They’re doing tests and results may not be back until tonight,” said the source. “So for now, he’s resting,” surrounded by loved ones including his daughter, Hana, and wife, Lonnie.

As first reported by Radar, Ali was admitted to the hospital just days before Christmas. He stayed there through the holidays after doctors initially diagnosed him with pneumonia, and later, a severe urinary tract infection.