By EMILY SHERIDAN
Ailing: Singer George Michael, pictured performing in Milan, Italy earlier this month, is suffering from pneumonia
George Michael has been forced a string of concert dates after being diagnosed with pneumonia.
The singer, 48, was hospitalised in Vienna, Austria, where he was due to perform on Monday.
As a result of his continuing medical treatment, his scheduled gig in Strasbourg, France, tonight and concerts in Cardiff this week have all been postponed.
All change: Michael informed fans of postponed gigs on his official website
The former Wham! star's spokesperson said he had been ordered to pull the gigs by his doctors and is currently receiving treatment in hospital.
His rep added: 'Plans to reschedule these postponed tour dates will be provided when available.'
His concert promoter Manfred Leodolter told Austrian press today: 'George Michael is still in Vienna. Doctors have warned him for the moment against flying and he is getting rest in Vienna.'
Michael's current hospitalisation is the second time he has been ill on his worldwide Symphonica Tour, which started in Prague, Czech Republic in August.
High praise: Michael's Symphonica tour has won round critics
Last month, he cancelled one of his three sell-out gigs at London's Royal Albert Hall due to illness.
At the time, his spokesperson said he was suffering from a viral infection and had a high temperature.
That gig has now been rescheduled for May 2012.
The singer's tour sees him performing with a 41-piece orchestra and in front of a giant red LED wall.
Critics have hailed Michael's concerts as a huge success with the Daily Mail's Adrian Thrills writing: 'A stunning finale from a performer who suddenly looks back to his best.'