Commonwealth leaders are meeting behind closed doors to discuss whether the Prince of Wales should succeed his mother as head of the 53-nation body.
On Thursday the Queen endorsed Prince Charles as the future leader at the Commonwealth Heads of Government Meeting (CHOGM) at Buckingham Palace.
She said it was her “sincere wish” that he takes over “one day”.
But the role is not hereditary and will not pass automatically to the Prince of Wales on the Queen’s death.
The leaders are expected to approve the move when they meet at Windsor Castle, but there has been no confirmation on whether there will be an announcement following the meeting.
Opening the summit on Thursday, the Queen said: “It is my sincere wish that the Commonwealth will continue to offer stability and continuity for future generations, and will decide that one day the Prince of Wales should carry on the important work started by my father in 1949.”
The body’s outgoing chair-in-office, Maltese prime minister Joseph Muscat, told delegates: “We are certain that, when he will be called upon to do so, he will provide solid and passionate leadership for our Commonwealth.”
The role, currently held by the Queen, is largely a symbolic one and carries no maximum fixed term.