Fremantle are under investigation from the AFL for ruckman Aaron Sandilands' late inclusion to the Dockers' selected team against Richmond at Patersons Stadium on Saturday.
Sandilands was initially named as an emergency by coach Ross Lyon before he was called into the side just 10 minutes before bounce down as a replacement for Jonathon Griffin who injured himself in the warm-up.
And with hot debate surrounding the decision, the AFL confirmed they would look into the circumstances, with a fine potentially on the cards.
"It'd be a financial sanction, it depends on how it's classified," AFL spokesman Patrick Keane said on Monday.
Tigers coach Damien Hardwick was left fuming with Sandilands' last-minute inclusion on Saturday.
"That's within the rules. Whether it's in the spirit of the game, I don't know. That's for you guys to find out,'' Hardwick said.
"I think everyone knows the answer to that question in here.
"You prepare one way, all of a sudden something happens, you've got to start preparing another way.''
Hardwick's comments were quickly played down by a bullish Lyon following his side's 22-point triumph.
"If anyone's calling us liars, they want to be really strong and have strong evidence," Lyon said.
"It's funny how the footy gods work. I was in shock myself. I understand what people think, but I'm not sitting here telling lies."If anyone makes accusations outside of that, they're well and truly out of line and want to be really careful.''