Star Sydney midfielder Kieren Jack could yet face Adelaide on Saturday after being cleared of a second significant ankle injury this season.

Jack, who has played just three games since missing five matches with an ankle injury, limped off ANZ Stadium shortly before halftime in last Saturday's loss to Collingwood.

Coach John Longmire feared the club's current best and fairest champion could have another lengthy sideline stint after re-injuring the ankle.

However, Longmire's fears were dispelled on Monday by an encouraging scan.

"There's no new damage which is really pleasing," Longmire told reporters.

"He's still a small chance for this week, so we've got our fingers crossed and hopefully he's OK.

"Even if he misses this week, I think in the end that wouldn't be a bad result for us because certainly Saturday night I went away thinking it could be another four or five weeks at the earliest.

"So to hear from the doctors and physios today that he is even a chance for this week makes me feel pretty pleased."

Longmire is also hopeful defenders Ted Richards (ankle) and Alex Johnston (calf) will be fit this week after missing the Collingwood game.

He said the decisions on their fitness would impact on whether versatile Lewis Roberts-Thomson remained in the backline against Adelaide.

While encouraged by Sydney's sustained effort in their gallant six-point loss to Collingwood, Longmire is keen to see the Swans produce an even better performance against struggling Adelaide.

"That will be our focus this week, to keep that effort going and to improve the areas we need to improve upon," Longmire said.

"We know it's always a tough game (against Adelaide). We know they are a proud football club and we know that Neil Craig is a very good coach.

"They've still got some really good players. We need to make sure that we are at our best in Adelaide to win the game.

"There's no point giving effort on the weekend, getting beaten and going to Adelaide and not giving the effort. We need to make sure we do that."

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