The win sets up a quarter-final appearance for Graiguecullen.
Graiguecullen needed extra time to get the best of Portarlington in the Laois Senior Football Championship.
A close contest saw Graiguecullen eventually pull away in the final few minutes of the game to claim a 0-20 to 1-15 victory in Laois Hire O'Moore Park.
The result means Graiguecullen progress to the quarter of the Senior Football Championship, while Portarlington will face another game in Round Three.
They've set up a date with Clonaslee St. Manman's, after they secured a 1-11 to 1-5 win over Stradbally.
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