The singer pleaded guilty last month to driving under the influence and possession of cannabis following an incident on July 4 when his Range Rover crashed into a photo shop in north London.
Police said Michael appeared "spaced out" when they found him sitting in the car, its engine still running.
It was the latest in a string of automotive and drug-related mishaps for the 47-year-old star.
At a hearing last month, Judge Robin McPhee banned Michael from driving for six months, and warned he could face jail time.
Michael is due to be sentenced Tuesday at Highbury Corner Magistrates Court in London.