Singer George Michael has postponed the remaining tour dates of his Symphonica UK tour after falling ill with pneumonia.

According to the Vienna Times, the 48-year-old Michael was rushed to a Vienna hospital on Monday.

“It's with great sadness that must announce the postponement of the remaining dates on the Symphonica tour due to George's on-going battle with pneumonia,” Michael's offical website announced on Friday.

“While George is receiving excellent medical care and is responding to treatment and slowly improving, to ensure his complete well-being, George's doctors have advised that he cannot perform the rest of his Symphonica tour and that he instead takes a full and compete rest.”

Hospital officials have refused to comment on the Faith singer's health, but a hospital insider told the Vienna Times that Michael's condition had worsened.

“I have not seen him myself but cardiac specialists and internists are treating him round the clock,” the unnamed insider said.

Michael announced his new symphony orchestra-backed tour in May during a press conference at London's Royal Opera House. He also announced he would be recording a new album during breaks on the tour.