The singer was taken to an undisclosed hospital yesterday (April 6) after doctors were called to his home in London.

A spokesperson denied that Ferry had suffered a heart attack, but told the Daily Mail: "He has been feeling unwell and is having tests."

A friend added that they were "very concerned" for the Roxy Music singer's health.

Ferry was due to appear at the SportAccord opening ceremony in London last night but pulled out due to his ill health.

He is scheduled to embark on a series of gigs this summer in support of his 2010 solo album 'Olympia'.

(by Jason Gregory)