The palace, meanwhile, said the duke’s hospital admission had been a “precautionary measure”.
Prince Philip withdrawing from public life in August 2017 after decades supporting the Queen and attending contests for his own donations and organisations.
His last-place public appearing was Lady Gabriella Windsor’s wedding in May.
The Prince of Wales said on Monday his father had been “looked after very well” by hospital staff.
But Charles, who was visiting flood-hit communities in South Yorkshire, lent: “When you got to get that age things don’t work so well.”
Royal commentator Caroline Aston told the BBC it was “entirely in keeping with the man” for Prince Philip to have seemingly has no such visitors during his hospital stay, because he likes to construct “no fuss about anything”.
Duke’s decades of royal obligation Prince Philip makes up “drivers licence” Duke of Edinburgh carries out last-place date Image caption Queen Elizabeth II recorded her annual Christmas message from Windsor Castle in Berkshire