Defiant Sydney midfielder Kieren Jack insists the Swans are confident of ending a six-year losing run against Collingwood on Saturday, even if few outside the AFL club give them a chance.

Sydney's nine-match losing streak against Collingwood was one of the few negatives of the legacy left by former coach Paul Roos.

Three changes, two of them forced, were made to the side that lost by 34 points to Carlton last weekend.

Ruckman Shane Mumford is suspended, impressive rookie defender Alex Johnson injured and speedster Lewis Jetta dropped.

Forward-ruckman Jesse White will backup Mark Seaby in the ruck, while Andrejs Everitt and Paul Bevan have both been recalled.

Lewis Roberts-Thomson, who has alternated between full-forward and backup ruckman in recent weeks, will return to his more familiar role in defence for the first time this season.

A clear betting outsider for Saturday's ANZ Stadium clash, the Swans are still looking for their first win against one of the current top four sides.

They have lost twice to Carlton and once each to Geelong and Hawthorn.

Jack said while Sydney probably lost a little bit of confidence through their loss to the Blues, noone had been walking around with their heads down and they were confident they could win on Saturday.

"We're not going to hold anything back this week, we will give it everything, we've got nothing to lose," Jack told reporters on Thursday.

"I don't think anyone outside of this footy club is going to give us much of a chance, but we certainly know if we get 22 blokes performing and ready to play four quarters, that we are definitely a chance to beat this mob.

"It's probably a good head space to be in, I think to go out there, with nothing to lose and everything to gain.

"A four quarter effort is crucial. There have been times this year when we haven't performed four quarter efforts and probably got away with a win, but against quality teams, against Collingwood you can't afford that."

Jack, who has yet to taste victory against Collingwood, believed execution and ball use was what separated sixth-placed Sydney from the top four teams.

Going from playing a surging Carlton into a clash with Collingwood would be the AFL's equivalent of jumping from the frying pan into the fire.

Nonetheless, Sydney coach John Longmire felt the challenge was just what Sydney needed after lowering their colours to the Blues.

"When you are coming off a loss like we did last week against Carlton, straight into a game against Collingwood that is the best chance to test yourself pretty much straight away and that's what's happening this week," Longmire said.

"You might as well play against the best when they are at their best. We'll certainly come up against that this week."

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