Fremantle have confirmed ruckman Sean Darcy will miss several weeks of the pre-season after sustaining a knee injury at training this week.

The 22-year-old will require to wear a knee brace for close to a month after suffering the injury and is now set to play catch-up as the Dockers prepare for the 2021 season.

Fremantle football boss Peter Bell revealed the extent of Darcy's injury and that the Dockers' tall will be re-assessed in the coming weeks.

โ€œScans have shown that Sean has damaged his arcuate ligament in his left knee,โ€ Bell told the club website.

โ€œThe current advice is he will need to wear a knee brace for the next two to four weeks.

โ€œThis means Sean will miss a number of weeks of pre-season training and the injury will be reassessed once he is out of the knee brace."

The Dockers are scheduled to face Melbourne for their opening pre-season clash on Friday, February 26 at Fremantle Oval before a match against the Eagles on Sunday, March 7.

Fremantle will face the Demons again to kick-off their 2021 premiership campaign on Saturday, March 20 at the MCG.