SYDNEY expects defender Callum Mills to be fit to face Gold Coast on Saturday, despite being concussed against Melbourne last week.

Mills was felled by a much-publicised strike from Demon Tomas Bugg in the opening minutes of the Swans' 35-point win at the MCG last Friday night, but has been able to increase his training in the lead-up to round 16.

Bugg was handed a six-game suspension by the AFL Tribunal on Tuesday night.

Sydney coach John Longmire said Mills has recovered well from the hit, but his selection for the Suns clash will be a decision for the club's medical staff.

"He's been ok during the week and at this stage we expect him to alright, but we still have to see how he pulls up after training," Longmire said.

"He's progressed really well since Saturday and that’s all we can go on, but once again, the doctor always has the final say."

Longmire said the Swans were satisfied with the sanction handed to Bugg during the week.

"Like most people, the first thought is that it seemed about right," he said.

"I'm like everyone else, you look at what happened and think we don't what that to happen in sport at any level.

"We understand things happen, but the off-the-ball ones we've got to be mindful of, and it's important for our sport that things like that don't occur."

In the wake of the Bugg ban, and the four-match suspension handed to Richmond's Bachar Houli for striking Carlton's Jed Lamb in round 14, there have been calls for a send-off rule to be introduced.

The Swans played with 21 men for most of the match against Melbourne after Mills was unable to come back onto the field, and while Longmire said he could see the merits in a red card system, he warned the decision-makers not to make any rash decisions.

"For that particular incident it would be hard to find a sound argument against a red card, but I also understand the other point that those sorts of incidents don't happen too often," he said.