West Coast skipper Darren Glass may be forced to rest for at least another week, with the AFL club still unsure about the extent of his groin injury.

Glass sat out of Sunday's 35-point loss to St Kilda due to his lingering groin soreness but Eagles' coach John Worsfold said the 29-year-old defender's immediate playing future was still unclear.

"We don't really know (whether he will be available) until we up his training load and see how he feels," Worsfold said.

"That will probably be mid-week before we make a call on that."

When asked whether it was possible Glass could be set for a long stint on the sidelines, Worsfold replied: "I'm not the expert on that.

"It's one of those ones that it might be fine this week or it might be another week, I can't really answer that."

West Coast's defence performed soundly against the Saints despite the absence of Glass.

Eric Mackenzie held Justin Koschitzke to just one goal while Beau Wilkes and Will Schofield also performed strongly.

Goalsneak Stephen Milne (three goals) was the only Saints forward to have a major impact, proving too elusive for Patrick McGinnity and Sam Butler.

St Kilda trailed by 17 points early in the third quarter but stormed to victory with nine of the final 10 goals of the match.

"The worrying sign was we had the opportunity to stop the flow but we didn't grab them," Worsfold said. "So it wasn't through not having opportunities, it was missed opportunities.

"They were there.

"If there were no opportunities to do that you'd be worried, but we just let ourselves down when the crunch time came."

West Coast's sixth loss of the season left the Eagles two wins and percentage points adrift of the top eight ahead of Sunday's clash with Carlton at Etihad Stadium.

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