Concerning footage has emerged of Fremantle's Sean Darcy appearing dazed post-game on Friday night.
Darcy's night was cut short by a concussion, but he took part in the team-song and looked to be out of sorts.
“It was a terrible look,” former Port Adelaide coach Ken Hinkley said on SEN.
“Sean is full of energy usually…he didn't know he was in that song.”
Darcy failed his head injury assessment earlier in the game after his head collided with Ned Long's chest.
The 27-year-old is therefore certain to miss next week's derby, and will have to work his way through the return-to-play protocols before he can play again.
The footage has been widely shared on social media, with many fans critical of the Dockers given he seemed out-of-sorts and did not sing the team song.
Fremantle won a dour contest by six points against Collingwood despite struggling to get the game on their terms for much of the game.
