A statement from Buckingham Palace said: "His Royal Highness The Duke of Edinburgh was admitted to King Edward VII Hospital in London this afternoon, for planned surgery on his hip which will take place tomorrow".
Prince Philip is getting medical attention after experiencing some trouble with his hip.
Prince Philip has entered a hospital and will have surgery on his hip Wednesday. Queen Elizabeth II, Kate Middleton, Prince William, Prince George and Princess Charlotte were among the royals who attended Easter services together.
"There's no cause for alarm but frankly he's a proud man and doesn't want to appear crocked in public".
"One of the reasons that Prince Harry has wanted this wedding to happen quite quickly - this is really whirlwind by royal standards - is because his 96-year-old grandfather, the Duke of Edinburgh, is retired now and Prince Harry really wants him to be at his wedding", Nicholl said.
He also missed last Thursday's Royal Maundy Service.
Philip has sharply reduced the number of charity events he attends since announcing his retirement, but still accompanies the queen on occasion.
Buckingham Palace said he was admitted to the hospital on Tuesday and that further updates would be issued when appropriate.
In June 2017, Prince Philip spent two nights in hospital as a "precautionary measure" for the treatment of an undisclosed infection.
When it was announced a year ago that he would be retiring from official engagements, Buckingham Palace stressed that the decision was not health-related and he had the full support of the Queen.
Queen Elizabeth paid tribute to her husband in November 1997 during their Golden Wedding Celebrations.