West Coast will likely need to beat Brisbane without Tim Kelly after the midfielder suffered a medial ligament injury to his left knee during Sunday's 15-point loss to Fremantle.
After falling out of the top eight for the first time since round six, the Eagles need to win in the last round and hope other results go their way after losing control of their finals destiny.
Senior coach Adam Simpson said Kelly was likely to miss the round 23 clash against the Lions, while forward Jamie Cripps had lost teeth after being caught high by a stray David Mundy elbow when the Docker had the ball.
The coach said the first-quarter "obliteration" was due to both a mindset issue from his players and Fremantle's ability to out-pressure and out-hunt his team.
He highlighted the Eagles' poor tackling efficiency, which had been an issue throughout the season.
Simpson also dismissed any controversy about Caleb Serong's match-sealing goal, which was set up by an Adam Cerra kick after Cerra had appeared to carry the ball over the boundary line.
"I'm not critical of the umpires for that at all. We probably should have got him out of bounds. There were three or four opportunities," Simpson said.
"It's hard to be critical of umpires in that situation. You don't know what they see. The last three quarters was a really good game of footy for us. The first quarter was the problem."
The Eagles will discuss Willie Rioli's availability to take on the Lions early in the week, with Simpson saying the premiership forward had done "nothing but impress us" since returning.
