Four clubs meet in O'Moore Park to fight for two places in the county final.
Portlaoise hold the edge over the remaining three clubs in the Laois Senior Football Championship, according to Rosenallis' John O'Loughlin.
The former O'Moore County star believes their performance in beating the defending champions St Joseph's last time out sets them apart.
The 35 times champions are looking to win their first championship since 2019 - they face O'Dempsey's in O'Moore Park on Sunday.
The competition's other semi-final pits Portarlington against Graiguecullen.
O'Loughlin says Portlaoise were impressive in beating last year's champions:
The action on Sunday begins with Portlaoise's game against O'Dempsey's at 2.15pm, Portarlington against Graiguecullen at 4pm.
Keeping Up Unbeaten League Start The Aim For Athlone Town Women
Two Pointer Rule Makes Big Difference To Gaelic Football - Emmet McDonnell
Shane Lowry Records Opening Round Of 72
Tullamore Town FC Ready For Red Letter Weekend
Busy Bank Holiday Weekend In Store For Athlone Town
Big Weekend Ahead In Leinster Minor And U20 Hurling Championships
Leinster SFC: Opportunity Beckons For Westmeath
Westmeath Footballer Luke Loughlin Ruled Out For Remainder Of Season
Laois And Westmeath Battle For Place In Leinster LGFA Decider
Alex Dunne Set For Action In Miami This Weekend
Fundraising Walk Planned For Westmeath Man Left Paralysed In Freak Accident
Shane Lowry In Action In Miami This Week
Westmeath Secure Leinster Minor Football Quarter Final
CCFL: Two Draws In Senior Division
Potential Hometown Fight On The Cards For Joe Ward
Ava O'Connor Breaks Personal Steeplechase Record
Laois Fixture In Two Weeks A "Massive Game" - Kevin O'Brien
Camross Camogie Honoured In Laois Following Historic All-Ireland Triumph
Athlone Town Secure Vital Win In Women's Premier Division
Laois And Westmeath To Clash In Leinster Camogie Decider