Port Adelaide senior coach Ken Hinkley confirmed the change earlier on Friday, with O'Shea's selection optimising the home side's match-ups against the in-form Tigers.
Impey and Ben Newton will play for the Magpies in the SANFL on Saturday.
If Port Adelaide defeats Norwood, it will go straight through the the 2014 Grand Final in two weeks
portadelaidefc.com.au will confirm its final SANFL squad after the Magpies' final training session on Friday night at 6:15pm.
Port Adelaide AFL First Elimination Final team v Richmond
Sunday 7 September 2014, 2:50pm, Adelaide Oval
FB: Jackson Trengove, Alipate Carlile, Tom Jonas
HB: Matthew Broadbent, Jack Hombsch, Jasper Pittard
C: Kane Cornes, Ollie Wines, Hamish Hartlett
HF: Robbie Gray, Justin Westhoff, Angus Monfries
FF: Jake Neade, Jay Schulz, Chad Wingard
Foll: Matthew Lobbe, Travis Boak, Brad Ebert
Interchange from: Cam O’Shea, Matt White, Jared Polec, Andrew Moore
Emergencies: Jarman Impey, Kane Mitchell, Ben Newton
In: O’Shea
Out: Impey
Port Adelaide AFL First Elimination Final team v Richmond
Sunday 7 September 2014, 2:50pm, Adelaide Oval
FB: Jackson Trengove, Alipate Carlile, Tom Jonas
HB: Matthew Broadbent, Jack Hombsch, Jasper Pittard
C: Kane Cornes, Ollie Wines, Hamish Hartlett
HF: Robbie Gray, Justin Westhoff, Angus Monfries
FF: Jake Neade, Jay Schulz, Chad Wingard
Foll: Matthew Lobbe, Travis Boak, Brad Ebert
Interchange from: Cam O’Shea, Matt White, Jared Polec, Andrew Moore
Emergencies: Jarman Impey, Kane Mitchell, Ben Newton
In: O’Shea
Out: Impey
