Meghan Markle and Prince Harry have released a statement following Prince Philip's death.
The Duke and Duchess of Sussex altered the homepage of their Archewell's site, giving tribute to Harry's grandfather.
They said: “In loving memory of His Royal Highness The Duke of Edinburgh 1921-2021. Thank you for your service... You will be greatly missed.”
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The Duke of Sussex is likely to attend his grandfather the Duke of Edinburgh's funeral.
Harry is living in the US with the Duchess of Sussex and has not returned to the UK since stepping down as a senior royal just over a year ago.
Funeral arrangements for Philip, who died on Friday morning at the age of 99, have yet to be confirmed, but it is likely Harry will be among the small number of mourners, the PA news agency understands.
It is not known at this stage whether the Duchess of Sussex, who is pregnant with her second child - a daughter, will accompany him.
During England's national lockdown, funerals can be attended by a maximum of 30 people.
It would be the first time Harry has joined the royal family since Megxit and also since his and Meghan's bombshell interview with Oprah Winfrey in which they accused the royal family of racism and the institution failing to support a suicidal Meghan.
The two-hour interview was aired while Philip was in hospital after surgery on his heart.
The Queen issued a statement saying "while some recollections may vary", the issues would be taken "very seriously", but dealt with privately as a family.
The Duke of Cambridge, in a rare move on a royal engagement, spoke out publicly saying "We're very much not a racist family", as the royals' ability to carry out official duties linked to diversity, inclusion and mental health was called into question.
