Both clubs were clear winners of their quarter finals on Sunday.
The semi-final line-up for the Laois Ladies Senior Football Championship has been set for this weekend.
Emo GAA will host the double header on Sunday.
Portlaoise meet Timahoe at 3.45pm.
After that St Conleth's will take on Sarsfields.
That game gets underway at 5.30pm.
Sarsfields were clear 4-15 to 0-4 winners over Park Ratheniska in Sunday's quarter final to book their meeting with St Conleth's.
While Timahoe managed to beat Ballyroan 4-8 to 1-6 on the way to their semi-final.