The Duke of Edinburgh spent a sixth night in the hospital.
Philip, 99, received no further visits from members of the royal family on Sunday after his eldest son, the Prince of Wales, visited King Edward VII’s hospital in London on Saturday afternoon.
The Duke was admitted to the hospital as a precaution on Tuesday evening after feeling unwell. He is said to have come in unaided.
Buckingham Palace said there was no information on the Duke’s condition after previously saying he was “in good spirits”.
His eldest son Charles made a 200 mile round trip from his home in Highgrove, Gloucestershire on Saturday afternoon.
Charles was the first member of the royal family to visit the Duke and it is believed that his visit was due to his father’s extended stay.
There were no further visits from family members to the Duke on Sunday, although police and security cars were in the hospital all day.
The Queen and Duke of Edinburgh pictured at Windsor Castle in June (Steve Parsons / PA)
Sources previously told PA News Agency that Philip would likely stay in the hospital for the coming week to “watch and rest”.
Heart-shaped balloons and a letter from a 10-year-old boy in North London wishing the Duke a speedy recovery were tied to the hospital railing.
Philip, who turns 100 on June 10, is in hospital for an unknown reason even though it is not a coronavirus.
Ten-year-old Twanna Saleh from North London had good news for the Duke of Edinburgh (Dominic Lipinski / PA).
He is known for his uncomplicated demeanor.
Royal writer Penny Junor told PA, “We all know he doesn’t like excitement and he would consider a visit to be excitement.”
She said she didn’t know why Charles was visiting on Saturday, but added, “There are significant things going on in the family right now, and I suppose it’s entirely possible that Charles wanted to speak to his father and reassure him about Harry . ”
The hospital’s website states that visitors “will only be considered in exceptional cases”.