Fremantle have confirmed a "moderate grade" hamstring strain to ruckman Sean Darcy, with a timeframe for the Dockers star's return to be assessed in due course.

Darcy underwent scans following Saturday's win over Melbourne, a match where he was subbed out in the second quarter after suffering the ailment.

He has since begun the reconditioning of his recovery, with the Dockers confirming the extent of the setback on Monday afternoon. Fremantle players have been given four-day break and will return to training on Thursday, with a better understanding of Darcy's recovery to be known in the coming days.

"Darcy returned to Perth for scans following the game, which have shown a moderate grade hamstring strain," a club injury update read.

Fremantle are scheduled for a timely bye this week before returning to face Richmond in Round 13 at Optus Stadium.

That break will give Darcy a fortnight to recover from his hamstring strain, with a moderate hamstring injury likely to required close to a month in recovery.

Darcy has enjoyed a strong campaign in 2023, recording 38 or more hit-outs in nine of his 10 appearances before Saturday's win over Melbourne. He is also averaging 13.82 possessions and 4.64 clearances per game.

The Dockers are set to face GWS and Essendon in Rounds 14 and 15.