The Queen Consecrated toes reportedly had a broken toe while performing duties at the King’s side.
Camilla was injured before the queen’s death and “quite a lot of pain,” according to The Daily Telegraph.
A source told the newspaper that he was “getting down to work” of supporting the king during an emotionally and physically exhausting week.
“It’s an unfortunate time, to say the least, but she was absolutely dead,” Tele reportedly said.
The PA news agency asked the king’s spokesman for a comment on his wife’s condition and was told: “We will not comment on the state of health.”
This is when the royal couple is due to visit Wales on Friday – the first visit by a king since his accession to the throne.
The King and Camilla will attend a service and reflection at Llandaff Cathedral, followed by condolences at the Senedd Parliament in Wales.
He will later hold a private audience with Welsh Prime Minister Mark Drakeford and Cardiff Castle’s presiding officer, although a protest against the monarchy is expected outside.
Charles will attend a reception hosted by the Welsh Government before returning to Buckingham Palace in the evening to host the religious leaders in the Bow Room.