Fremantle midfielder Hayden Young is set for an extended stint on the sidelines with the hamstring injury suffered against St Kilda expected to keep him out for at least a month.

Young missed the start of the Dockers’ campaign with two strains to his right hamstring but strung together three consecutive games in the AFL after returning through the WAFL.

However, the run came to a devastating end for the 24-year-old on Friday night at Marvel Stadium, Young clutching high up on the back of his leg in pain after a diving tackle during the second quarter of the Docker’s nightmare defeat to St Kilda.

The defender-turned-midfielder was assisted from the ground by a trainer and taken straight to the rooms.

He was then subbed out of the clash barely five minutes later, with 7NEWS’ Mitch Cleary reporting that the star could miss four to six weeks on Sunday.

Fremantle coach Justin Longmuir couldn’t hide his concern during the post-match press conference either.

“We’ll get a scan, but it doesn’t look great,” he said

“It looks serious. It is concerning.”

Young has been averaging around 20 disposals per game since his return in 2025 as well as having kicked four goals.

The injury compounded another horror road trip to Melbourne for Fremantle who just a fortnight ago were stunned by the Demons at the MCG.

The Dockers managed just one goal for the entire first half, kicked by Young, and had just two heading into the last quarter before succumbing to a 14.10 (94) to 5.3 (33) hammering.