Harry, 33, Queen Elizabeth's grandson and the sixth-in-line to the British throne, and Markle, 36, will marry on Saturday at St George's Chapel in Windsor Castle.
He suffered a heart attack last week and will now undergo heart surgery.
Britain's Prince Harry and his United States fiancee Meghan Markle have chosen George and Charlotte, the children of the royal's elder brother Prince William, to be among the bridesmaids and page boys for their wedding, his office said on Wednesday.
After the incident, a spokesperson at the Kensington Palace has said Prince Harry and Meghan Markle have asked for understanding and respect from everybody in the deeply personal moment for the couple, days before their wedding. Markle's father, according to TMZ, has been embarrassed by the accusation that, in exchange for large sums of money, he staged photographs showing him getting measured for his wedding suit and making other preparations.
From controversy over the photos to racist online abuse, here are the issues Meghan and Harry have had to deal with on their way to the aisle.
He said that if the doctors let him out in time, he will make the journey to travel to the wedding.
Harry and Markle have invited 600 guests to the wedding, which will be followed by a gala reception hosted by the queen.
Royal toddlers Prince George and Princess Charlotte will lead a crew of 10 bridesmaids and page boys accompanying Meghan Markle and Prince Harry down the aisle on their big day, Kensington Palace announced Wednesday.
Mr Markle reportedly told the entertainment website that his daughter tried calling him on Monday but that he was not near his mobile to pick up.
57% of respondents said they think the royal family should pay the full cost of the wedding, including security costs.
The Internet is focused on three things this week: Yanny, Laurel, and Thomas Markle.
But Ragland is perhaps most likely to take on the task, given her particularly close relationship with her daughter. I don't know as of today what his plans are, but there's a very real concern, I wanted to see him go (to the wedding), I didn't want him deprived of that.
The royal family are now paying for the ceremony and reception, with taxpayers picking up the tab for policing and security.