Veteran French rocker Johnny Hallyday announced Wednesday that he is being treated for cancer, but added in a Twitter message that his life was not in danger.

"I was actually screened a few months ago for cancer cells for which I am currently being treated," he wrote.

"My life is not in danger today," added the 73-year-old who has been described as the French Elvis.

"I'm doing very well and am in good physical condition," he added.