George Michael ‘in rehab’

George Michael has reportedly checked himself into rehab.

The 51-year-old Careless Whisper singer has a history of substance abuse, having gone to jail five years ago after pleading guilty to cannabis possession and driving under the influence of drugs.

And according to German magazine Bild, George has admitted himself into Switzerland-based treatment facility The Kusnacht Practice to seek help once again for smoking excessive amounts of pot.

Reports claim George was smoking 25 joints per day before checking into the Swiss rehab centre.

Treatment at The Kusnacht Practice can cost over $100,000 per patient. The facility is known for treating high-profile clients, as iconic fashion designer John Galliano supposedly sought help there in the past.

In March 2014 during an interview with the Big Issue, George claimed he'd quit using marijuana entirely.

"I've completely stopped. I have decided to change my life and I haven't touched it for well over a year and a half now," he told the publication.

George drove his car into a storefront in July 2010, and he later served four weeks in prison for his DUI.

And soon after being released from jail, he spoke of how the experience changed his mentality forever.

"I want to beat my drug addiction and lead a normal life," George is quoted by British newspaper The Sun as saying at the time. "I don't want to end up back in prison. It's a very horrible place to be. You're not considered a person when you're inside, you're just a number and that freaked me out."

Following his stint in jail, the pop star experienced a number of harrowing near-death events, including being unconscious for three weeks in December 2011 after falling ill with pneumonia.

In May 2013 George fell out of his moving vehicle while driving on a motorway in the UK, which resulted in a head injury.