The 48-year-old singer started his tour in August, before playing a homecoming concert in London last month at the Royal Albert Hall.
But the former Wham! star was forced to cancel a second show at the venue on 26 October after he fell ill, and also cancelled his scheduled date in Vienna, Austria, on Monday.
He has now been forced to pull out of tonight’s gig in Strasbourg, France, as well as his weekend dates in Cardiff, Wales, because of his ill health.
His reps said in a statement: 'Singer George Michael has been forced to postpone the Cardiff dates (26th and Sunday 27th of November) of his Symphonica tour due to illness. [He] recently postponed tour dates in Vienna and Strasbourg under doctor's orders after being diagnosed with pneumonia and he is currently receiving treatment.'
The Careless Whisper singer has since apologised for axing his London show and has rescheduled the gig for May next year.