They won the midweek jackpot with a €12 quick-pick ticket bought at the American House shop in Bundoran.
The couple, who wish to remain anonymous, told National Lottery staff that they have nothing definite planned for their winnings yet.
A spokesman for the Lotto told Donegal Daily “Yes, the couple have collected their cheque and we can confirm they are from Co Donegal.”
No other details of the couple have been released in a bid to keep their identity secret.
Special has mounted since yesterday that a soldier based at Finner Camp owned the winning ticket.
Saturday’s Lotto jackpot stands at a guaranteed €2m.