DESPITE winning three games in a row, assistant coach Chris Scott knows Fremantle will have to lift to another level to win in Sydney tomorrow night.

Fremantle has struck winning form with wins over Melbourne, Port Adelaide and West Coast over the last three weeks, but Scott is well aware the Sydney Swans are a much bigger test.

"We aren’t kidding ourselves over our form. We know we've beaten three sides that are around last on the ladder so this is going to be another step up this week," Scott said before the team flew out of Perth on Friday.

"We are looking to continue the form we've shown in the last few weeks, but we will have to play better to win against Sydney at the SCG. We've seen some considerable improvement in our young players and it's just another challenge for them."

Fremantle has done plenty of work on winning the contested ball heading into the clash on the smaller SCG, and is hoping in-form forwards Luke McPharlin and Matthew Pavlich benefit from the dimensions of  the ground.

"The size of the SCG does come into it because you are going from our home ground, which is the biggest in the competition, to the smallest so it does take a small adjustment to your game style," he said.

"Sydney plays very well in congestion partly because of their small ground so we will need to adapt to that. We do have forwards in form at the moment, though, and the small ground gives you the opportunity to get the ball quickly into them."

While the Swans regain Leo Barry and Adam Goodes for the clash, Fremantle loses Jeff Farmer through suspension, Shaun McManus to retirement and Ryan Murphy has been dropped for forward Adam Campbell. .

Defender Roger Hayden also comes into the side, along with Andrew Browne after his 33 possession-game for Claremont in the WAFL last Saturday.

"We have been experimenting with our forward set-up and we think the dimensions of the ground suit Adam because he is a big strong forward that will jump hard at the ball, especially when there's a bit of congestion. When I was playing I wouldn’t have liked to push back into his space, that's for sure," Scott said.

"We've been really keen to play Browney for a while. He had a terrible run with injuries the last few years and then had a bad luck contact trauma recently. We are confident if he can play his best football, he has a big future for us and we will be giving him every opportunity for the rest of the year."