Players are being encouraged to check their tickets.
One Euromillions player in Offaly is more than €115,000 better off this afternoon.
National Lottery is asking everyone in the county to check their tickets and emails as the prize is yet to be claimed.
The winner matched five numbers and the bonus, leaving them one short of collecting the €45.8m jackpot.
The winning numbers were 04, 05, 14, 33, 18 and the Lucky Star numbers were 07 and 12.