FREMANTLE draftee Hayden Young appears to have hit an obstacle in his push for an early debut, joining the Dockers' rehab group on Monday.

Young, who was on track for early opportunities after a strong first pre-season, missed Fremantle's intraclub hitout on Friday and did not train with the Dockers' main group on Monday.

 The No.7 pick in the 2019 NAB AFL Draft completed running work with trainers at the Dockers' Cockburn base, dragging weights and moving well.

Hayden Young with his agility test award at the NAB AFL Draft Combine. Picture: Getty Images

The reason for his withdrawal from the main training group is not clear, with football manager Peter Bell hopeful on Friday that he would still receive early opportunities.

"If not in the Marsh [Community] Series, I know that with what he's done so far he's put himself in a position where potentially there will be an opportunity early," Bell said after the Dockers' intraclub.

PRE-SEASON FIXTURE Check out your team's Marsh Community Series games

Meanwhile, second-year Dockers midfielder Luke Valente ran laps early in the session, while exciting draftee Liam Henry was introduced to the main training group after arriving with a knee issue.

Liam Henry and Michael Walters during Fremantle's team photo. Picture: AFL Photos

Fremantle is looking for wing replacements after the loss of Bradley Hill and Ed Langdon, with recruits Blake Acres and James Aish appearing to be at the front of the queue heading into the Marsh Community Series opener against Carlton on Saturday at David Grays Arena in Mandurah.

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Exciting draftee Michael Frederick shapes as a wildcard during the pre-season, however, after an eye-catching performance in the Dockers' intraclub.

Fremantle's Michael Frederick at a recent training session. Picture: Getty Images

Frederick has been told to play on instinct by coach Justin Longmuir, and he has put himself in the mix to win selection as a pre-season bolter.

The 19-year-old lined up on a wing and across half-forward on Friday, providing a highlight when he burst from a pack and converted on his right foot from 45m.

"He (Longmuir) just says keep it simple. We do a lot of mental skills stuff behind the scenes and that's one of the things, just keeping it simple," Frederick said.

"You do have to think about the structure and all that stuff, but if you play off instinct the other stuff will come."

Frederick, who idolised Hawthorn champion Cyril Rioli and new teammate Michael Walters as a junior, said he had wiped 30 seconds off his 2km time since joining Fremantle and improved his tackling.

The South Australian, who was recruited with pick 61 in the 2019 NAB AFL Draft, is now aiming to play in the Marsh Community Series and push his case for round one.