President Michael D Higgins and Taoiseach Micheal Martin are expected to be among hundreds of world leaders attending the funeral of Queen Elizabeth in London on September 19.
The late monarch is due to be buried after a funeral mass which is due to take place in Westminster Abbey next Monday.
Last week, Mr Martin would not confirm whether he would head to London for the funeral, telling reporters that it was a decision to be made by officials in the UK.
