He will have a scan on Monday and anything more serious than tightness could sideline him for the remainder of the Swans' flag tilt, with a preliminary final in just under two weeks and the Grand Final a week later.
"I'm not sure how bad (it is), but he seems pretty positive, so fingers crossed that it all goes well for him," said Rhyce Shaw, the Swans’ other dynamic rebounding half-back.
"It doesn't seem too bad, but we won't know anything until that scan tomorrow morning.
"Hopefully he gets back because he's a really important player for us and I certainly want him out there. He's fantastic."
One option for coach John Longmire if Malceski doesn't make it back for the preliminary final is swinging co-captain Jarrad McVeigh into the vacant position, which he dropped back to fill on Saturday.
Shaw, who has suffered his share of injury woes over the past two seasons, tried to lift the spirits of his good mate Malceski after he came off the ground.
"I just said 'keep positive, we'll try and do the best we can and try and get the win so he can get an extra week to recover and hopefully get back for the prelim'," Shaw said on Sunday.
"We're pretty close, so I just got over to him and gave him a bit (of support)."
Shaw, who like Malceski has undergone LARS surgery on a knee, found some form against Fremantle in his third game back from an ankle injury, racking up 23 disposals against the Dockers.
"It was really important to get those two games in before the final, I wasn't playing great footy in those games," Shaw said.
"But I got some form last night and that was the main thing."
Shaw said having a week off was definitely an advantage after such a tough and taxing game.
Meanwhile, Shaw implored dasher Gary Rohan to keep running and chancing his arm despite his error-marred first half in Saturday's qualifying final win over Fremantle.
Speedy Rohan made errors which led to Fremantle's first two goals, and had two wildly inaccurate shots for goal in the second quarter.
Rohan was much more productive in the second half, as he continued to back himself after getting the support of his teammates.
"We just told ‘Gaz’ to run as fast as he can and hope for the best," Shaw joked.
"We want Gaz to break the lines and that's what he's in the team for.
"Those skill mistakes, they will come. I used to make a thousand of those when I was younger, so it doesn't really matter.
"You get over that and you mature as you go along.
"But at the moment we want Gaz to defend and to break the lines and he was doing that.
Senior coach Dean Cox talk sus through 2 changes to the list ahead of round 2 clash with Hawthorn.
03:38
"Unfortunately he didn't get up in time" - Cox
Hear from Swans senior coach Dean Cox ahead of our Thursday night clash with Hawthorn.
38:11
The life and journey of the Amartey Party - More than Footy Podcast
On this week's episode of the More than Footy Podcast presented by Bing Lee, Paps and Dre are joined by forward Joel Amartey as we deep dive into his unusual journey into football, living dynamics and the mental preparation that goes into a set shot.
01:45
A look back at a special weekend for the Foundation and ARA First Nations Academy
Round 1 against Brisbane provided a chance to celebrate the incredible work of the Sydney Swans Foundation, who play a big part in the lives of young athletes in the ARA First Nations Academy.
Hear from senior coach Dean Cox as he discusses the team's injury list and facing the Hawks this Thursday night.
Tipping: Round 1 Ladder is in!
Following a big Round 1, the Official Tipping Competition of the Sydney Swans, presented by bitcoin.com.au leaderboard is in!
TEAM: Two changes for Round 2
Two changes for Thursday night footy against the Hawks at the MCG.
ARA First Nations Academy cap off unique weekend in Sydney
Participants from the ARA First Nations Academy have taken part in a multi-day cultural camp, highlighted by games on the SCG and Tramway Oval and a special Bridge Climb experience