George Michael has been forced to cancel a host of concert dates after being diagnosed with pneumonia.

The 'Faith' singer was hospitalised on Monday (21.11.11) in Vienna, Austria, and had to axe his gig in the city as well as a concert in Strasbourg, France.

However, he is still not fully recovered and has cancelled two performances in Cardiff, Wales, which were due to take place later this week.

A statement on his website read: "With great regret, George Michael has been forced to postpone his November 26 and 27 shows in Cardiff, Wales, due to his on-going illness. George was recently forced to postpone tour dates in Vienna and Strasbourg under doctor's orders after being diagnosed with pneumonia. He is currently receiving treatment."

His representative added: "Plans to reschedule these postponed tour dates will be provided when available."

George, 48, will stay in Vienna until he is fully recovered from the illness.

His concert promoter Manfred Leodolter said: "George Michael is still in Vienna. Doctors have warned him for the moment against flying and he is getting rest in Vienna".

Last month, George apologised to fans after he pulled out of his second 'Symphonica: The Orchestral Tour' show at London's Royal Albert Hall because of back problems, a viral infection and high temperature.

His spokesperson said: "George is disappointed that he cannot perform tonight's concert, but he has been advised to rest. He received a tremendous reaction from the audience last night and is very sorry that he has had to postpone."

The cancelled Royal Albert Hall show will now take place in May next year.