Fremantle coach Justin Longmuir confirmed defender Brandon Walker sustained a dislocated shoulder during Sunday's loss to Sydney, which is a repeat injury for the 22-year-old.
Walker attempted to tackle Swans forward Joel Amartey in the second quarter of the blockbuster clash but pulled away from the contest grimacing and holding his shoulder after receiving a clean bump from Will Hayward.
Longmuir confirmed the injury post-game and conceded it didn't "look great".
"He's going to be sore," Longmuir said.
"He's dislocated his shoulder. It's the same one he hurt over the pre-season.
"I haven't had an update from the doctors but it doesn't look great.
"I thought 'Drapes' (Josh Draper) came on and played his role really well, so we'll see where it lands."
Longmuir also admitted his side wasn't "good enough" during the critical moments of their tight loss to Sydney.
Fremantle have lost seven of their last nine games, five of which they led at three-quarter-time.
The Dockers' late-game fadeouts cost them a finals berth in 2024, and the trend has disappointingly continued into the new year, with Sydney only reclaiming the lead with 86 seconds remaining in the match.
Jye Amiss clunked a mark inside 50, but it was a second late after the siren, with Sydney players rejoicing before Amiss had claimed the ball.
"We put ourselves in a position to win, then couldn't get it done," Longmuir said.
"Across the day I felt like we (needed to) make more of our entries, felt like we were predictable with the way we entered the ball inside forward 50.
"We had 31 inside 50s in the second half for four goals so we need to make more of that. Late, just didn't quite execute the way we wanted to execute."
Longmuir continued to hammer home that his side let themselves down in the clutch, citing poor decision making and nervous moments that left his side "vulnerable" to a Sydney counterattack.
"Players need to understand the little things are the big things in those moments. How all our phases link into each other and we need to be better at closing out games than what we've shown," Longmuir said.
"Everyone's disappointed. We had some moments there, we just need to send the ball to different areas.
"We have youngish players getting caught up in moments at the moment, and we need to make sure that in those moments, whilst we'd like to score, we need to make sure we're not left vulnerable behind the ball.
"There was probably three or four moments with the ball we needed to send the ball to a different area. It might close our chance off of scoring a little bit but we won't be vulnerable to them scoring and we'll be able to play in the area that we want.
"We weren't good enough in those moments."
Fremantle play the Eagles in the Western Derby in Round 3 in a chance to make amends for their 0-2 start. West Coast come off hot of a valiant display against the reigning premiers at the Gabba, presenting an enticing matchup for the current 17th and 18th placed clubs on the ladder.
