SYDNEY coach John Longmire admits he's not sure who will replace captain Callum Mills as the Swans prepare for their preliminary final against Port Adelaide.

Mills' hamstring injury creates a dilemma for the Swans coach and his football department, with defender Robbie Fox and unlucky midfielder Taylor Adams two obvious candidates.

Mills was hurt at training last week and Longmire said on Monday he had not been ruled out should Sydney win through to the Grand Final.

Adams was dropped for Sydney's qualifying final win over Greater Western Sydney, while Fox is the obvious call if the Swans want another defender to replace Mills.

"I'm not sure yet. Obviously we weren't sure until we realised who we're going to play, now we've got that in front of us," Longmire said on Monday.

"We're talking through those things at the moment.

"Hopefully there's a couple of options there. Is it a like-for-like type? We know we can't replace his leadership abilities.

"We've got some options there that we're looking at the moment. Nothing's locked in."

The Swans must overcome an eight-game losing streak against Port that started in 2017.

Most recently, the Power humiliated them by 112 points on August 3, taking a 71-point lead before the minor premiers posted their first score.

But Longmire leaned into the narrative that the "season starts again" in the finals, saying they won't waste time reviewing their round 21 disaster.

"It doesn't really help you. We know we weren't good enough and Port Adelaide were terrific," Longmire said.

"That's where it's at ... this week's a new week.

"It's just about playing well this week. They're a very good football team. They have been for a long time.

"They've been so consistent. They've been coached well. They're a great playing unit, and so they've always been hard to compete against and they certainly played well against us last time."

Longmire said resisting Port Adelaide's pressure around the contest would be crucial after watching the Power's semi-final win over Hawthorn.

"It was red hot early on in the game, and it stayed that way for the entire game," Longmire said.

"It was a fierce contest and Port Adelaide were able to apply enormous pressure on the opposition.

"They were able to withstand the heat that Hawthorn were able to apply and they were able to stand up in the moments, and to their great credit.

"That's the thing that really stood out."

Tensions boiled over after the final siren at Adelaide Oval and Port was fined $20,000 for coach Ken Hinkley's taunts of Hawthorn players.

"The only thing I will say is, coaches are front and centre of a lot of things, and it's a pretty tough job," Longmire said.

"Kenny's done a fantastic job with that football team."