RETURNING Swan Leo Barry says he wants to extend his career at the club but admits the side's form in 2008 has been unacceptable.

"I'll look to play next year. I still feel really good in my body, but the last two years I've missed a little bit of footy, which in some respects has helped me a little bit," the 31-year-old defender said on Friday.

Barry returns to the side for the clash against Collingwood on Saturday night after four weeks out with a hamstring injury. He was due to come back last Saturday against Geelong but, as a precaution, was given an extra week off after a small setback at training.

The four-week spell has reinvigorated the 2005 premiership player, who only has a contract to the end of 2008, and he said the enforced spell helped him make a decision about the future.

"My performance has been OK and I still feel I can contribute to the team. I've spoken to the club about it (a new contract) and that'll probably be resolved at the end of the season. So hopefully I finish off really well and move on to next season."

The Swans are now in sixth after holding down a top-four spot for much of the season. Going into the crucial round-21 clash with the Magpies at Telstra Dome, the Swans have only enjoyed two wins since the round-13 defeat of Melbourne, and finals football is still uncertain with two games left.

In the last seven weeks, the Swans have also conceded more goals than fans have become accustomed to, a point that particularly troubles Barry, who is keen to see the squad go a long way into September.

"I think collectively we definitely have a point to prove. Regardless of whether you're out of contract, old or young," he said.

"Everyone's sort of on notice at the moment and the way we've been playing has been unacceptable for what we require from each player. Everyone's on notice and we really need to get back to the way we (usually) play footy."

But getting back on track is going to be a tough ask against Collingwood, a side which has inflicted five losses on the Swans in their last five meetings, including last season's elimination final.

The Magpies are also just two competition points and one position behind the Swans on the ladder, giving the game massive importance to both sides' destiny beyond round 22. 

Coach Paul Roos hinted the Swans may do a few things differently this time, although Barry was tight lipped on what tactics may change.

"There may be few different structural things. We've pretty much played the same game plan in previous seasons, so there may be a few things we'll change, but it won't be massive change.

"I think our ball use pretty much determines whether we win or not but ultimately it'll be determined on whether we turn up to play or not."