Fremantle's AFL finals aspirations may be done and dusted but the team still has plenty of motivation to win games, according to coach Mark Harvey.

Just one win from 11 rounds of football have left the Dockers floundering in 15th spot on the table.

But Harvey said his charges were eager to derail the premiership hopes of other teams, starting with Saturday's clash against North Melbourne at Subiaco Oval.

The Kangaroos are clinging to eighth spot on the table with St Kilda and Carlton just two points further behind.

"I think any side we play from here on - there will be a danger in the result," Harvey said.

"It would be fair to say we are looking to derail whoever we play in the second half of the year.

"If that's the Kangaroos and they're fighting for a finals spot, so be it."

The Dockers have made four changes to the team that lost to Brisbane last week.

Ryley Dunn has been promoted off the rookie list and rushed straight into the side, while forward Ryan Murphy, utility Byron Schammer and defender Roger Hayden also return.

Kepler Bradley and Scott Thornton have been omitted, while Shaun McManus (knee) and Heath Black (suspended) also exit.

The Kangaroos, who have won three of their past four meetings against Fremantle at Subiaco Oval, are still without spearhead Nathan Thompson, who underwent arthroscopic surgery on his left knee on Thursday night and will be out of action indefinitely.

But the Roos regained star midfielder Daniel Wells from a knee injury as well as Josh Smith, while Scott McMahon and Leigh Brown have been axed from the side.

Dunn's inclusion in Fremantle's side caps a remarkable turnaround for the 22-year-old, who appeared destined for the AFL scrapheap when he was de-listed by the Dockers last year.

But Dunn was thrown a life-line when the club redrafted him as a rookie.

Paul Hasleby's season-ending knee injury then allowed him to work his way back onto the senior list.

Injuries have not been kind to Dunn, who has played just five games in four-and-a-half seasons with the Dockers.

There were high hopes for the talented onballer when he was taken with pick No.10 in the 2003 national draft.

But a broken collarbone in his first season - suffered in an off-the-ball incident - followed by a raft of knee and hamstring injuries hampered his career.

"I've pretty much hurt most areas of my body," Dunn said.

"But there are other people worse off than me ... Luke Webster and Andrew Browne have been through hell as well.

"I was always confident I could get my body right ... a couple of those injuries were bad luck."

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