The Duke of Edinburgh will miss a church service attended by members of the royal family, as his stay in hospital enters its fifth day.
The Queen is among those expected to attend the service at Crathie Kirk, near Balmoral, later today.
But Philip, 91, continues to receive treatment for a flare-up of a bladder infection at Aberdeen Royal Infirmary.
The Duke has so far not received any visits from his relatives after doctors on Friday advised him to rest.
He was admitted to the NHS hospital on Wednesday, during his and the Queen's annual summer break at Balmoral.
Officials said at the time that he would be in the infirmary for a few days and it remains unclear when he will be discharged.
He is said to have been in regular contact with members of his family by telephone.
The Duke of Edinburgh was in good enough spirits when he left Aberdeen Hospital after a five-day stay that he shared a joke with the staff.
The Duke of Edinburgh joked with Aberdeen Royal Infirmary staff as he bid farewell after five nights of care for a bladder infection.
The Duke of Edinburgh has spent a third night in Aberdeen's Royal Infirmary and is said to be responding well to treatment