"We are happy to announce that Mr Michael is improving steadily with an impressive regression of pneumonic symptoms and follows a steady rate of improvement as hoped," doctors Gottfried Locker and Christoph Zielinski said.

"There are no other health issues with regards to the patient other than the underlying pneumonic disorder, and no further measures had to be taken ... As we said previously, complete rest and peace and quiet are mandatory."

The 48-year-old former Wham! star's pneumococcal infection necessitated intensive care due to its severity and extension, they added, declining to comment further.

Michael's agent said Friday that the illness has forced the singer to to postpone the rest of his "Symphonica" tour, having performed 45 shows to date. He had been due to give a concert in Vienna when he was admitted to hospital.