"His Majesty will be proclaimed king at a meeting of the Council of Succession at 10:00 tomorrow, September 10, at St. James's Palace," TASS said in a statement.
Queen Elizabeth II of Great Britain died on September 8 at the age of 96.
The new king of the United Kingdom will be Prince Charles of Wales.
According to him, the death of his mother was for him "a moment of great sadness."