King Charles has "extended his stay at hospital" after surgery for an enlarged prostate, an insider has claimed, as Queen Camilla has visited her husband for the fourth time.
The King, 75, planned on staying at The London Clinic for two nights following the operation on Friday, but has now stayed for a third night.
"It is understood that Charles would only stay in hospital for longer than two nights if there was some kind of unexpected issue," a source told The Sun.
They added that the third night at the clinic "is entirely precautionary" but may have caused "some unease".
King Charles has stayed in hospital for a third night
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This comes as the monarch will likely halt royal duties for a short time after leaving hospital.
Queen Camilla visited the King on Sunday evening, and was seen smiling in the back of the car when she departed the London Clinic at 7:06pm.
It was the Queen's fourth visit to see her husband since he was admitted to hospital.
Camilla previously visited her husband that day, four hours earlier.
Queen Camilla departing the hospital on Sunday evening
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King Charles will have a "period of recuperation", according to reports, but will be able to attend to government papers once he is discharged.
Queen Camilla was also seen smiling as she visited her husband at midday.
Wearing a teal-coloured top, she smiled as she entered the hospital's back entrance.
On Saturday, Queen Camilla visited the King for three hours, where he is staying at the same hospital as Princess Kate.
Queen Camilla departing The London Clinic on Friday evening
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Queen Camilla departing the hospital after Charles's surgery on Friday
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Camilla told people outside the London Clinic on Friday that the King was "doing well" after the procedure.
Charles also took time to visit his daughter-in-law, Kate, who is recuperating after undergoing a successful operation on January 16.
A Buckingham Palace spokesman previously said the King was "admitted to a London hospital for scheduled treatment".
The spokesman added: "His Majesty would like to thank all those who have sent their good wishes over the past week and is delighted to learn that his diagnosis is having a positive impact on public health awareness."