Port Adelaide coach Mark Williams believes a growing belief within the AFL club will help the Power win games they don't deserve to.

West Coast led the forward 50m entry count 60-37 at Subiaco Oval on Saturday night but the Power hung tough and made the most of their opportunities to post a thrilling three-point victory.

Former VFL star Jason Davenport was the hero with four goals in the final term as the Power overcame a 13-point deficit at three-quarter time to win 13.11 (89) to 12.14 (86).

"It's great to have a range of players who can kick multiple goals in quarters," Williams said.

"Once they start believing in themselves you start to build a great, resilient team.

"Invariably you get shut down one week (or) one quarter.

"But if you've got that belief inside you and also that memory and experience of 'gee I've done this before', you can do it again.

"It's always the first breakthrough time you do it it's like 'wow', but once you've done it before it becomes much more repetitive.

"We'll take the four points no doubt but what we'll take is the knowledge we can do stuff from behind against adversity with everything stacked up against us.

"There's not one person besides the Port Adelaide people here who would have been backing us.

"I'm even sure my son ... he wouldn't have backed West Coast but he might have gone to bed at three-quarter time."

Williams praised his side's ability to hang tough during periods of utter West Coast dominance.

The Eagles kicked four goals to nil in the third quarter and had 18 inside 50m entries to three as ruckman Nic Naitanui exploded to life.

But the damage was limited by Port's excellent defence, led superbly by Troy Chaplin.

"To be fair West Coast smashed us for about half of the second quarter and all of the third quarter," Williams said.

"We just totally hung on, hung on and hung on but the belief of the boys and the effort they showed in the last quarter, they should be really proud of it.

"I thought (Justin) Westhoff and (Dean) Brogan were outstanding.

"They just kept going at it.

"The last quarter they were very significant for us. Our backs were terrific, they won so many one on one contests.

"Jason Davenport had a pretty non eventful game until the last quarter.

"He kept missing goals.

"He had great opportunities but just didn't take them.

"To keep the confidence in himself and to be able to finish off like that (in the final term) was terrific."

The unbeaten Power tackle fellow high flyers Brisbane at AAMI Stadium on Saturday but Port are likely to be without Paul Stewart, who was knocked unconscious by a fierce hip and shoulder from Eagles defender Shannon Hurn.

Fellow defender Jacob Surjan is also in doubt after being stretchered off late in the match after hitting his head while laying an awkward tackle on Eagles midfielder Brad Ebert.

Williams said he expected small forward Robbie Gray to return for the Brisbane clash while Daniel Motlop is also a chance to play his first game of the season.

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