The tickets were sold in Dublin and Carlow.
The National Lottery is asking the two winners of last night's Lotto Plus draw to get in touch.
Both players won €500,000 by matching 5 numbers in the draw.
The tickets were sold in Dublin and Carlow and the winning numbers were 2, 9, 11, 16 and 28.
The lucky pair should sign their tickets and contact the claims department as soon as possible.
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