Prince Philip, the Duke of Edinburgh, has been admitted to a hospital as "a precautionary measure" after feeling unwell, Buckingham Palace announced Wednesday.

-His Royal Highness The Duke of Edinburgh was admitted to the King Edward VII Hospital in London, on Tuesday evening- a palace spokesperson said in a statement.

-The Duke's admission is a precautionary measure, on the advice of His Royal Highness's Doctor, after feeling unwell- it noted.

-The Duke is expected to remain in hospital for a few days of observation and rest- the statement added.

Prince Philip, the 99-year-old husband of Queen Elizabeth II, had spent 11 days in hospital care because of a bladder infection in 2015.

The queen and the duke are to celebrate their 74th wedding anniversary in November.