Westmeath show just the one change from the side that beat Sligo in the previous round ahead of Saturday's qualifier clash with Galway in Salthill.
James Durkan (17), from the Ballinagore club, takes over from the injured John Connellan at right corner forward. Connellan suffered a shoulder injury against Sligo.
David O'Shaughnessy, the 2004 Leinster winning captain, is not fully recovered from an Achilles injury and is named among the substitutes.
Galway are expected to name their side later tonight.
They are definitely without forward Seán Armstrong, who has a hamstring injury, and Derek Savage remains doubtful with the leg injury that forced him to miss the Connacht final defeat to Mayo.
Ja Fallon could also make a dramatic return from intercounty retirement.
The winners of the tie will meet Dublin in the All-Ireland quarter-final on August 12th.
Ian Fitzgerald comes in at full forward on the Laois team to play Offaly on Sunday. He replaces Gary Kavanagh with Brian McDonald moving to the corner.
Westmeath (SF v Galway): G Connaughton; D Healy, J Keane, F O'Boyle; M Ennis, D O'Donoghue, G Glennon; D Duffy, P Bannon; D Heavin, G Dolan, A Mangan; J Durkan, D Glennon, D Dolan.
Laois (SF v Offaly): F Byron; A Fennelly, D Rooney, J Higgins; P McDonald, T Kelly, P McMahon; B Quigley, N Garvan; B McCormack, C Conway, R Munnelly; B Sheehan, I Fitzgerald, B McDonald.