Philip, or the Duke of Edinburgh as he is known in Britain, retired from public life last August.
Greek-born Philip has remained at his wife's side throughout her 66-year reign, the longest in British history, and has earned a reputation for brusque comments and occasional gaffes at some of the thousands of ceremonial events he has attended.
The 96-year-old Duke of Edinburgh was admitted to King Edward VII Hospital in Marylebone yesterday for the procedure. Philip announced his retirement from royal duties in May although he still accompanies the queen on occasion.
"I declare my consent to a contract of matrimony between my most dearly beloved grandson Prince Henry Charles Albert David of Wales and Rachel Meghan Markle, which I consent I am causing to be signified under the Great Seal and to be entered in the books of the Privy Council", the Queen, 91, said in a statement after a meeting at Buckingham Palace on Wednesday, March 14.
Ananda Nanu, the board's president, said hip replacement patients need strong pain relief after their operations.
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"The Duke of Edinburgh was admitted to King Edward VII Hospital in London last night, as a precautionary measure, for treatment of an infection arising from a pre-existing condition", a Buckingham Palace spokesman said at the time.
His final solo engagement was in August past year, when he reviewed a parade of Royal Marines outside Buckingham Palace in his capacity as Captain General of the corps. Details about the hip surgery, however, have not been revealed.
"He is progressing satisfactorily at this early stage", the palace added in a statement Wednesday.
Prince Philip was admitted to the hospital on Tuesday afternoon, for what Buckingham Palace has described as planned surgery on his hip.
And the Duke has missed a series of events in recent days including the annual Maundy service, also held at St George's Chapel, on March 29 where the Queen distributed out Maundy money to members of the congregation.