Sydney will be sweating on the fitness of young guns Daniel Hannebery and Gary Rohan ahead of Friday's night's AFL semi-final against Hawthorn.

Hannebery, 20, was subbed off at three-quarter time in the 25-point win over St Kilda on Saturday night after hurting his left shoulder.

The 2010 Rising Star winner had a similar problem with his right shoulder last year.

Rohan, 20, missed more than three months of action early in the season with a knee problem and was complaining of soreness in the same joint late in Saturday night's match.

Sydney coach John Longmire said Hannebery had wanted to return to action for the last quarter, only to be over-ruled by the club's medical staff.

"He's always a kid who's pretty keen to come back on and play, that's why he's been such a good player for us," said Longmire.

"I spoke to the doctors briefly and they said it was his good shoulder.

"He played with it last last year and got through and played really well so he's a chance next week."

Rohan's explosive pace has been important for the Swans in his eight games of an injury-interrupted 2011 campaign.

"His knee was a bit sore towards the end, it was probably a bit of knee, a bit of cramp, there were a couple of things that were going wrong with Gary at the end," said Longmire.

"We'll just have to see how he turns up on Monday.

"We'll need to do everything right with those blokes, make sure they have a good week and freshen up."

The match review panel is also likely to look closely at a crude, high spoil by Sydney's Shane Mumford on opposing ruckman Ben McEvoy in Saturday night's match at Etihad Stadium.

The Swans held sway for much of the night, with Longmire particularly pleased that they managed to wrest back the momentum in the last term after St Kilda had kicked four straight goals to cut the margin to just eight points at three-quarter time.

"They're a quality team, they've been in the last two grand finals and to have the ability to stop that and give a bit more back was good," said Longmire.

"We knew they'd come at some particular time.

"We'd spoken about it before the game, that good teams are going to get some momentum and they certainly had their chance.

"We thought at halftime that some of the things we were doing were pretty good and we knew they'd come out after halftime because they've got some champion players who want to keep playing football at this time of the year."

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