The Power has named its extended squad of 25 to play the Cats, with Jake Neade, Ben Newton inclusions on the interchange bench along with Dom Cassisi, Sam Gray, Cam O'Shea and Jared Polec.
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Jack Hombsch has been named on the field but Ken Hinkley says the coaches will review his fitness on Friday ahead of naming a final squad.
Hombsch missed the Power's thrilling win over West Coast with a hamstring injury.
"The team deserves an opportunity to go again, and whether we make one change will come down to Hombschy and whether he pulls through OK in the next 24 hours," Hinkley told portadelaidefc.com.au.
"If he does then he'll play and will be the only change to the side."
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Hinkley confirmed the decision was made to hold Monfries over for at least one more week so his hamstring was fully recovered.
"Gus trained for the full session today and got through, but there's an old hamstring philosophy that if you think they're OK you give them one more week to make sure," he said.
Port Adelaide will confirm its final teams for both the AFL and SANFL tomorrow afternoon at 4:30pm (ACST).
Port Adelaide Round 6 AFL squad v Geelong
FB: Jack Hombsch, Alipate Carlile, Jarman Impey
HB: Tom Jonas, Jackson Trengove, Matthew Broadbent
C: Matt White, Travis Boak, Kane Cornes
HF: Aaron Young, Justin Westhoff, Ollie Wines
FF: Robbie Gray, Jay Schulz, Chad Wingard
Foll: Matthew Lobbe, Brad Ebert, Hamish Hartlett
Interchange from: Dom Cassisi, Sam Gray, Jake Neade, Ben Newton, Cam O'Shea, Jasper Pittard, Jared Polec
New: Newton
In: Hombsch, Neade, Newton
Port Adelaide Round 4 SANFL squad v West Adelaide
FB: Tom Logan, Tom Clurey, Ben Haren
HB: Campbell Heath, Angus Bruggemann, Anthony Biemans
C: Zac Hawkins, Steven Summerton, Paul Stewart
HF: Andrew Moore, John Butcher, Kane Mitchell
FF: Cam Hitchcock, Mitch Harvey, Sam Colquhoun
Foll: Brent Renouf, Jake Neade, Ben Newton
Interchange from: Karl Amon, Darcy Byrne-Jones, Aseri Raikiwasa, Ben Sawford, Robbie Young
New: Hawkins
In: Renouf, Hawkins, Raikiwasa, Sawford
Out: Slattery (hip), Ah Chee (ankle)
Port Adelaide Round 4 Academy squad v West Adelaide
FB: Tom Corcoran, Matthew Williams, Declan Hamilton
HB: Jack Foster, Ciaran Hollingworth-Hughes, Matt Venter
C: Tom Gray, Jack Cooper, Nathan Krakouer
HF: Sean Davidson, Sidney Masters, Danny Butcher
FF: James Deeley-Godfrey, Keenan Ramsey, Sam Gordon
Ruck: Jonathon Ross, Brad Coulson, Kyran Dixon
Interchange from: Jack Foster
