PORT Adelaide expects star midfielder Robbie Gray to prove his fitness and play in Showdown XXXVIII on Sunday against Adelaide.

Gray missed last Saturday night's win over Hawthorn after suffering a corked calf. 

He has been eased through this week but trained on Thursday.

Power midfield manager Michael Voss said Gray would be a welcome inclusion, but warned the playing group that the reigning best and fairest winner wouldn't decide the Showdown.

"He's pretty confident but it's still a bit 'wait and see'," Voss said on Thursday morning. 

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"He's got to get through his training. 

"Clearly he's a very important player to us and a very valued player so we'd certainly take him if he's available, but we've also got to go in with a mindset that he isn't going to be the difference.

"Games of footy aren't won just on individual brilliance - you have moments of that throughout the game and that's the cream on top, but it can't do the job for you."

Voss doesn’t believe the form table has flipped after round four's contrasting results for the Power and Crows, with Port notching a terrific win over the reigning premiers and Adelaide slipping badly against the Western Bulldogs.

"Last week we were up against it - all of a sudden one week against the Hawks somehow that's turned, and with the Crows not getting the result they're after somehow they're not in form?" he said. "We just know that's not the case.”

"If you [believe that], you'll disrespect the competition and you'll get your right whack.

"We know what the Crows will bring; they'll bring incredible pressure and intensity … they're a very capable football team."