Brownlow Medallist Adam Goodes is set to miss several matches with his mystery groin ailment as Sydney coach Paul Roos admitted his hobbled star should not have played last weekend.

Roos revealed Goodes could miss "two or three weeks" as the AFL club attempted to unravel the nature and extent of the injury that has affected him for the past fortnight.

First Goodes struggled in his side's narrow win over Carlton two weeks ago, then was ineffective again in the Swans' loss to Adelaide on Saturday night.

Roos confirmed Goodes would be confined to the sidelines for at least the Swans' finals-shaping clash with the Western Bulldogs in Canberra next Sunday.

"He shouldn't have played," Roos admitted of Goodes against Adelaide.

"He wasn't able to contribute at all and it impacted significantly on our ability to win the footy.

"You have to have a healthy team. This week he just won't play.

"We can't put him in a position where he can't perform.

"So it might be two to three weeks but who knows? He just can't function with whatever injury he has got and we are better to pick someone who can."

But the Swans could welcome back key defenders Leo Barry and Nick Malceski from injury - Malceski a late withdrawal for three successive matches with a calf problem.

Meanwhile, Port Adelaide skipper Warren Tredrea will miss the rest of the season and is likely to need a full shoulder reconstruction.

Tredrea and young midfielder Steven Salopek went into mothballs for the rest of the Power's wretched year because of injuries.

Salopek is battling Achilles tendonitis.

"The odds are that Tredders will have a total shoulder reconstruction - we think it will happen that way, which obviously means he won't play again this year," Port coach Mark Williams said.

"He's disappointed with the shoulder injury because his last few games have been pretty good and I thought he played really well on Sunday, especially coming off the Kangaroos game which was probably his worst."

But Williams said 29-year-old Tredrea, whose contract expires at the end of this season, would be offered a new deal for 2009.

Young Western Bulldogs defender Dylan Addison was scheduled to undergo surgery on a knee injury which is likely to end his season.

The Bulldogs confirmed Addison had damaged the medial ligament in his knee, and will miss at least eight weeks following an operation to repair it.

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