Speaking on RTÉ's Morning Ireland, National Lottery CEO Dermot Griffin said there are a lot of syndicates involved in jackpots of these sizes and every victor reacts differently, but he said the National Lottery would provide professional advice to the victor.
The victor purchased their ticket in Ireland and will need to contact the National Lottery there to claim the prize.
The only other known winners was the bus syndicate from Dublin while there have been ten since 2004 who have remained anonymous.
"The first thing we tell them is to sign the back of the ticket and make contact with the National Lottery - so they can ring through to our claims area and naturally we'll guide them through the process from there".
What county was the winning EuroMillions ticket sold in?
"We hope it's true but we don't know yet".
"A lot of syndicates play when the prize is that large or it could be a family syndicate and they have each other for support".
Ireland has had 10 EuroMillions jackpot winners and the United Kingdom has had 63.
In 2005 Dolores McNamara from Limerick became one of Europe's richest women when she scooped €115 million (worth now approximately £99 million) on the EuroMillions.
An Irish player matched five main numbers and two lucky stars in Tuesday's draw.
To date, the National Lottery has raised over €4.9 billion for good causes and funds projects in Youth, Sports, Recreation, Amenities, Health, Welfare, Arts, Culture, Environment, National Heritage and the Irish Language.