Lotto bosses have revealed that the €2.4 million jackpot in Saturday night's draw was sold to a lucky punter in Co Galway.
The player bought their ticket online and even selected their own winning numbers to scoop the life-changing prize.
National Lottery chiefs said that the winner has not yet come forward but confirmed that a notification had been sent to the user's online account, as well as an email asking them to get in touch.
The winning numbers in Saturday night's draw were 10, 16, 17, 24, 26, 42 and the bonus number was 35.
And Lotto bosses are calling on all online players, particularly in Galway, to log into their accounts and check their emails to see if they won the €2,475,303 top prize.
It is remarkably the third Lotto jackpot win in the space of just three weeks after players in Cork and Westmeath also scooped the jackpot.
A National Lottery spokeswoman said: “One lucky online player in Galway is waking up today as Ireland’s newest multi-millionaire.
"The online ticket holder has also brought the number of Lotto jackpot winners over the last three Saturdays to 3, following a Westmeath player who won €6.4 million in the 22nd May draw and a player in Cork who scooped €2.4 million in last weekend’s 29th May draw.
"We are encouraging all of our online players to check their accounts and emails carefully today and if they are the winner, to make contact with our prize claims team on 1800 666 222 or claims@lottery.ie and we can officially begin the prize claims process.”
