Legendary French-Armenian singer Charles Aznavour, 90, has been hospitalised for an infection and has postponed a concert due to be held later on Friday, Oct 10 in Geneva, organisers said, according to Agence France-Presse.

Dubbed "France's Frank Sinatra," Aznavour is one of the country's best-known and beloved singers, whose ballads are recognised the world over.

"Charles Aznavour has been preventively hospitalised after contracting an infection in recent days," the Opus One event managers said in a statement, without providing more details about his condition or which country or hospital he was being treated in.

The activist-singer's planned concert in Geneva on Friday evening had been postponed, but he and the organisers would try to reschedule the concert "as soon as possible," the statement said.