Glass received the knock in the first quarter of last week's loss to the Lions but fought out the match giving coach John Worsfold hope his skipper may be fit for selection.
"They (the scans) revealed that he's got a tiny bit of muscle damage – a very slight strain," Worsfold said on Wednesday.
"He got through the game, which is generally the biggest indication he might be able to get through (again), but we won't know that until the very last minute."
Glass has appeared hampered for most of the season with speculation he was playing through injury despite the All-Australian full-back playing every game in 2008.
Worsfold said the 27-year-old has been fit to play all season but the club would be cautious when deciding his fate this week.
"If there's a high risk of him tearing it, then we won't play him. Even if he feels as though he might be able to get through, we've got to read the risk and we'll do that," Worsfold said.
"If we think he's fit to play, he'll play. If it's too much risk we don't want him breaking down in a game.
"He's been fit and able to play (this season). AFL footballers wouldn't play much footy if they pulled out when they were a little bit sore.
"Glassy is in no different position than probably 75 per cent of players."
Following the trend of setting his young players challenges in 2008, Worsfold said the job of following in-form Saints spearhead Nick Riewoldt would fall to Beau Wilkes, Matt Spangher or Eric Mackenzie if Glass does not come up for the match.
Wilkes was responsible for Lion Jonathan Brown at times last week while Eric Mackenzie, in just his second game, manned Daniel Bradshaw at the Gabba. Matt Spangher has played just two games this season but has been in terrific recent form playing for WAFL side East Fremantle.
"It'll be one of the young ones," said Worsfold, who has lost experienced duo Adam Hunter (knee, shoulder) and Brett Jones (knee) to season ending surgery in the past fortnight.
"They've all got good capabilities in that they're all good runners as well - that's one of the big things about playing on Riewoldt.
"(It's) another great challenge for them and another great opportunity that they wouldn't have got otherwise."
"That's the best learning curve; one to play at senior level and then to play on the best players and know that's your job for the day. It's invaluable."
