Fremantle star Hayden Young has had a torrid run with injury over the past few seasons, but if there were any lingering concerns about his fitness they were abolished on Friday night.

Young was one of the driving forces behind Fremantle's miracle 28-point comeback win over Sydney in the Preliminary Final, kicking a crucial goal on the three-quarter time siren from the 50m arc on the boundary to cut the margin back to 21 points.

The 25-year-old has battled through soft tissue and concussion issues in recent years and many wondered whether the club or the league would get to see the best of the explosive and skilled midfielder.

Speaking after the game, Fremantle coach Justin Longmuir said he was "really proud" of how Young has gone about his recovery, and his performances for the club on the big stage.

"Some people come into the AFL system and they play from the very start and they don't seem to get an injury. They get great continuity and he has been the opposite really," Longmuir said.

"He had a serious injury in his first year and it just feels the last couple of years, whenever he has got a decent run at it, something interrupts him. But we have been so proud of his attitude.

"To feel the disappointment of those injuries but then get back to rehabbing it and getting stronger, getting better and coming back and performing the way he has. I thought he took a real big step forward last week.

"Like I said before, his physicality was really good all night and he was one of the winners we had in the first half. To get his moment on three-quarter time and finish it, gave us a lift."

Young finished the game with one goal, 28 disposals, seven tackles and seven score involvements.

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The most impressive stat though, came from the fact he spent only 68 per cent time on the ground. Only Mason Cox had less time on the ground for Fremantle than Young, and yet his impact was arguably the most of any Docker over the four quarters.

Young has been on similar minutes since he returned for Round 21. Longmuir said it is a plan that will likely continue into next weekend's Grand Final.

"It hasn't necessarily been about trying to get him to play 85 per cent 90 per cent game time," he said.

"It has been to get him to play his role for as long as he can, you probably think that's about 70-75 per cent. But 75 per cent of Hayden Young is way better than zero per cent.

"He is able to influence the game in a lot of different ways and he is starting to peak at the right time."

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