Birdy's in Carrickmacross sold Saturday's winning Lotto ticket.
A Monaghan person has claimed the top prize in the weekend's Lotto Plus 1 draw.
Wednesday's Lotto jackpot could become the highest jackpot on offer in more than 10 years and a single winner would become the 8th highest Lotto jackpot winner in the history of the game.
Birdy's has been on the main street in the town for almost 100 years, and manager of the family run newsagents Colm Birdy says the excitement is all over the town this morning.
He says that the win is a great boost for locals and the business after a tough 18 months: