While West Coast eye a top-four finish Matt Rosa's 2012 AFL campaign is over.
The midfielder has a suspected broken collarbone for Saturday's win over Collingwood and the Eagles don't expect him to recover in time to play again this season.
"He's devastated. It's bad timing for him," Eagles coach John Worsfold said of Rosa, who missed last year's finals series with a knee injury.
Worsfold was buoyed by the return of spearhead Josh Kennedy, who booted just one goal but got better as the game wore on in his first AFL appearance since round five.
But it was Nic Naitanui who stole the show against Collingwood, with the 22-year-old's dominance in the air and at ground level cutting the Magpies to shreds.
"I don't know whether he's a tall or a small yet," Worsfold said.
"When he takes that ball to ground he's unstoppable."
Meanwhile, Collingwood coach Nathan Buckley admits his team are lacking self belief and need to rediscover their mojo in a hurry if they are to make an impact during the AFL finals series.
The Magpies were sent tumbling down to fifth spot on the table following an insipid 49-point loss.
Collingwood were thrashed in most of the key statistical areas, with West Coast winning the hit-outs 60-12, the clearances 48-23, the inside 50m count 53-33 and contested possessions 142-109.
Even more worrying for the Magpies was the continued dreadful form of spearheads Travis Cloke and Chris Dawes, with the duo failing to kick a goal between them in the 15.17 (107) to 8.10 (58) rout.
Two losses on the trot have severely dented Collingwood's confidence.
But it's not completely doom and gloom for the Magpies, who will finish in the top-four if they beat Essendon next week and West Coast loses to ladder-leaders Hawthorn.
Buckley again refused to lay the blame squarely on the shoulders of Cloke and Dawes, claiming the whole team needed to improve their psyche.
"Belief becomes a massive thing for any athlete," Buckley said.
"When you play a team sport, I think the belief of the team becomes paramount as well.
"We're a week away from a final series and we've got to find it in a hurry.
"I'm not talking about personnel, I'm taking about psyche; the psyche of our team and the belief of our team."
The Magpies are set to welcome back ruckman Darren Jolly against the Bombers, while skipper Nick Maxwell (groin) will be further assessed in the lead-up to the game.
Utility Sharrod Wellingham is likely to undergo scans after injuring a finger in his left hand against the Eagles.
Back-up Magpies ruckman Cameron Wood was clearly out of his depth against powerful Eagles duo Dean Cox and Naitanui.
But Buckley conceded Collingwood's ground-level troops didn't roll their "sleeves up and dig in" to stop West Coast's onslaught at the stoppages.