PORT ADELAIDE will be forced to make at least one change for its blockbuster clash with Collingwood at Marvel Stadium on Friday night.

Robbie Gray is expected to miss the next month of football after breaking his hand against North Melbourne last weekend.

A number of players have performed strongly in the SANFL so far this season and will be in contention to face the Pies.

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Jack Trengove has been in scintillating form for the Magpies, averaging 38 disposals, seven tackles, seven clearances and a goal a game in 2019.

Steven Motlop backed up his strong performance against Norwood a fortnight ago with 18 touches and two goals against Woodville-West Torrens last week.

Joe Atley was also good against the Eagles with 31 possessions, six clearances and four tackles, while Billy Frampton returned from a two-week suspension with five goals.

Matthew Broadbent was again the general across half-back, while Karl Amon, Sam Mayes and Kane Farrell have all been pushing strongly for an AFL recall.

The final teams will be announced on Thursday evening.