Dogs midfielder Treloar has missed the past three weeks with a similar issue and must pass a fitness test before taking on the Cats at Marvel Stadium on Saturday night.
Signs are good for the 30-year-old, who averaged 29 disposals and six clearances over the opening seven rounds of the season.
"Adam's recovery from his hamstring injury has gone exactly to plan," Bulldogs head of sports medicine Chris Bell said.
"We have graduated his speed and training demands over the last few sessions, with him completing a game like training session on Saturday.
"He still has one or two boxes to tick before we can confirm his availability, but at this stage he is on track to return to play this weekend."
Darcy sustained his hamstring injury during the second quarter Fremantle's upset win over Melbourne on Saturday and was substituted out of the match.
The Dockers have their mid-season bye this week before hosting Richmond at Optus Stadium in round 13.
"Darcy returned to Perth for scans following the game, which have shown a moderate grade hamstring strain," the club said in a statement.
"The players will officially return on Thursday following a four-day break, however, Darcy has already commenced his reconditioning at the club.
"A time frame for Darcy's return will be finalised as he progresses through his reconditioning."
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