Saturday's €19m winning Lotto ticket was bought in Castlebar in Co. Mayo.
The prize was finally won after rolling over for 60 draws over a 7 month period.
Lotto spokesperson Sarah Orr says they haven't heard from the country's newest multi-millionaire just yet.
"We are hoping to hear from the winner soon.
"We'd also advise players in Mayo, or people who bought their tickets in Mayo, to keep checking those tickets."
