Fremantle coach Ross Lyon says North Melbourne is a "formidable opposition", and will brace his side for a big challenge on Saturday night.

The Dockers have won their last two games, while North has been close in all four, but ultimately fallen short.

“The ledger says 0-4, but we know they’ve (the Kangaroos) played some very good footy,” Lyon said.

“We understand we’re playing a formidable opponent that has their backs to the wall.

“You don’t have to do much wrong in AFL football. (Lindsay) Thomas had a kick to win the game (against the Bulldogs).

“They played some pretty good footy against the Cats as well, so we’re not playing any mugs here, we’re playing a formidable opposition.”

The Dockers are hopeful of having Michael Walters and Stephen Hill available for the match at Domain Stadium.

“Sonny (Walters) got up last week so he’ll get up this week,” Lyon said.

“He’s in a lot better shape. I think he had 20 (disposals) and kicked one (goal) in a really courageous effort so we expect him to be better again.

“And Stephen’s a bit like Michael was last week. He had a cork and he’ll get to the line OK.”