Sydney coach John Longmire admits he is prepared to wait until matchday on Sunday before giving midfielder Kieren Jack the all-clear to make his return against Richmond at the SCG.

Jack has been sidelined with an ankle injury and has missed the past five matches as the Swans chase their first three game winning streak of the season against the Tigers.

He passed a fitness test on Friday and his inclusion in the final 22 at the expense of Andrejs Everitt was the only change to the side that routed Brisbane last week

Longmire said Jack trained and moved well on Friday and felt good after the session, but he would wait to see how he pulled up on Saturday.

"It is looking positive, but it is the first time he's joined in the main training session for a number of weeks so the real key is how he pulls up," Longmire said.

"We've got the flexibility to even wait until Sunday to make a final decision on whether he plays."

Sydney have notched four victories and a draw away from home this year, but have won just two out of five at home and only one out of four at the SCG.

Buoyed by successive victories over North Melbourne and Brisbane, Sydney is on their third two-win streak of the campaign.

Ruckman Mark Seaby said it was vitally important Sydney win on Sunday.

"Because it means we're starting to string a few wins together which is critical, we don't want to win one, lose one, we want to try and get the winning streak going," Seaby told reporters.

A fine full forward in his playing days with North Melbourne, Longmire warned that Richmond's 2010 Coleman Medallist and current leader Jack Riewoldt could turn the game in a blink of an eye.

But Longmire stressed Riewoldt, who has already kicked 36 goals this year, was not the only Tigers forward who would warrant close attention from his defence.

"(Dustin) Martin is a really dangerous marking forward, and so is Tyrone Vickery and Jake King has kicked 19 goals as a small pressure forward," Longmire said.

"Richmond have got some real variety in their attack, it's not just about Jack Riewoldt.

"Richmond are one of the up and coming teams everyone is talking about in regards to likely finalists this year or in the immediate future, so we have a big challenge to try and beat them this week.

"It's important for us to consolidate our position."

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