The Sydney Swans are well aware of the midfield threat posed when they come up against Greater Western Sydney on Saturday.

Swans star Josh Kennedy stood alongside Ryan Griffen today with the pair likely to be reacquainted at Spotless Stadium in the eighth Sydney Derby.

Kennedy is the clearance king at the Swans and is ranked second in the competition for contested possessions, so his role in the engine room will be crucial for his side.

While the visitors might have the edge in experience against the Giants, Kennedy said both he and his fellow midfielders knew the quality of players they would be up against.

"It's one of the strongest parts of their team and if we can get on top there and try and spend the majority of the game in our forward half, it will go a long way towards winning the game," Kennedy said.

"They've had an amazing year and they've got some quality players and we know that each year they've gotten better and are really competitive.

"They knocked off Hawthorn earlier in the year so from our point of view it's going to be a tough game as it always is, (and) very physical.

"They're really hard at it, (and are) a great contested ball team so there's a lot on the line.

"We want to get a top four spot and feel like we have to win every game from here to get that."

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GWS take on the Swans with their season and finals hopes on the line, but will do so without co-captain Phil Davis.

The key defender has been ruled out for the rest of 2015 after injuring his hamstring in the first half against the Power.

The loss of Davis will no doubt mean a reshuffle for the Giants' defence, and Griffen says the loss of the skipper is a blow.

"He's been massive for us, he's had his ups and downs over the years but he was playing some consistent footy early for us," Griffen said.

"For him to go down, it hurts, but we'll have someone come in and cover him and hopefully we can play some really good footy this weekend.

"It's a do or die game for us if we want to make finals. I know the young boys want to get their first finals appearance, so we're looking to get a good result."

Gary Rohan and Lewis Jetta celebrate with a high five when the two team's clashed earlier this season.