The couple from Co Armagh who scooped the €130 million jackpot in the New Year's Day EuroMillions draw will go public at a press conference in Belfast on Friday, draw operator Camelot has said.
The lucky ticket holder came forward to claim the £114,969,775 jackpot prize yesterday.
The pair will become the fourth biggest winner in UK history.
A further ten players also pocketed over £1m each in the New Year's Day draw.
Camelot said the prize money will be paid when the ticket is validated.
The winning main EuroMillions numbers were 01, 08, 11, 25, 28 and the winning EuroMillions Lucky Star numbers were 04 and 06.
With what is the fourth largest jackpot win in UK history, the winners would be able to afford some lavish items.
Among them, 575 tickets to space with Virgin Galactic, at a cost of over £200,000 each; nearly 154,000 iPhone XRs, at a cost of £750 each; and would be able to pay footballer Cristiano Ronaldo's contract at Juventus for more than four years.