SYDNEY Swans coach John Longmire won't be contacting the AFL's umpiring department to seek clarification over two costly 50m penalties in his side's five-point loss to Hawthorn on Thursday night.

The Swans had a tough night at the SCG, giving up goals to Jonathan O'Rourke on the three-quarter time siren, and Jonathon Ceglar in the tense final term, when they were penalised for entering the protected zone.

Swans co-captain Kieren Jack and Ben McGlynn were the players responsible for what looked to be very close calls, and Longmire said after the match that he has no idea if the interpretation of the rule has changed.

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"I don't know, ask the umpires," he said.

"I don't know, I really don't know to be honest."

While clearly frustrated by the penalties, Longmire said there's no point in seeking an explanation from the men in green.

"No, I won't worry about it, I'll worry about what I can control," he said.

Another interesting statistic saw the Swans receive only four free kicks in general play up until three-quarter time, compared to Hawthorn's 13; with the count going the visitors' way 15-9 by the end of the game.

"Obviously we were undisciplined because I don't think I've seen a differential like that for quite a while," Longmire said.

"I'll have to go back and we'll have to get better at our discipline clearly, because that's a big differential."

WATCH: John Longmire's full post-match media conference

Longmire was of course bitterly disappointed to lose yet another close game, the Swans' third defeat by single figures this year after they went down to Richmond by one point in round eight, and the Western Bulldogs by four points in round 15.

He did however take some positives out of the loss and said the season was well and truly alive.

"We win tonight and we're on top of the ladder, so I'm still pretty confident with the year we've got," he said.

"I think we've made some giant steps forward and I think we've still got a fair bit of footy to play this year."