Prince Philip has been transferred between hospitals again.
Buckingham Palace announced just after midday on Friday (11.31pm AEDT) the Duke of Edinburgh had been taken back to King Edward VII Hospital in central London to continue treatment.
"The Duke is expected to remain in hospital for continuing treatment for a number of days," the palace said in the statement.
© GettyAn ambulance leaves the St Bartholomew's Hospital where Britain's Prince Philip is being treated in London, Friday, March 5, 2021
The news comes after the 99-year-old underwent a procedure at St Bartholomew's Hospital on Wednesday for a pre-existing heart condition.
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"The Duke of Edinburgh yesterday underwent a successful procedure for a pre-existing heart condition at St Bartholomew's Hospital," Buckingham Palace said in a statement on Thursday.
"His Royal Highness will remain in hospital for treatment, rest and recuperation for a number of days."
© Steve Parsons/PA WireEarlier this week Prince Philip's daughter-in-law, Camilla, revealed the Duke is
Earlier this week Prince Philip's daughter-in-law, Camilla, revealed the Duke is "slightly improving" and they were remaining hopeful.
Video: Prince Philip recovering from procedure (Sky News Australia)
Prince Philip recovering from procedure
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"So that's very good news. We'll keep our fingers crossed," Camilla said during a visit to a London vaccination centre on Wednesday.
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Prince Philip was first taken to King Edward VII Hospital 18 days ago as a "precautionary measure" after "feeling unwell".
© APWhile Prince Philip has had a number of health battles in recent years, this current stint has become his longest hospital stay ever (Photo: 2012)
The palace later revealed that the Queen's husband was being treated for an infection.
However, after almost two weeks of treatment, the Duke was transferred on Monday to St Bartholomew's - a specialist hospital in cardiac care - where he later underwent the undisclosed procedure.
While Prince Philip has had a number of health battles in recent years, this current stint has become his longest hospital stay ever.
© GettyPolice officers are seen outside the King Edward VII hospital where Prince Philip, Duke of Edinburgh is currently receiving treatment on February 18, 2021 in London, England