Nankervis, whose case will be heard on Tuesday night, was sent directly to the tribunal over a high bump that concussed Sydney's Jake Lloyd.
The fallout was costly for the Swans, who lost one of their chief playmakers for more than half of last Thursday night's contest.
Sydney coach John Longmire said tightened rules around concussion - and the increased likelihood players will be ruled out of matches - meant a send-off rule should be considered.
"I was always in the 'no send-off' camp over the years but what's happening in the game now, it's changing a fair bit in regards to HIAs (concussion assessments)," Longmire told reporters on Monday.
"I understand the sub is there to help mitigate those things that are happening more and more, but often that sub is not the type of payer you have in your starting 22, it's a different type of player and you can be unsettled.
"I don't think there is a cut and dry answer. It doesn't mean that everything is right."
Longmire said that if a send-off rule is introduced, it should not apply to 50-50 decisions.
"They only have to be the really obvious ones. If you get in that grey area, it's too big a penalty," he said.
"I don't think it should be put off the table. You are just trying to move with the way the game is going."
Nankervis is facing a possible three-match ban for rough conduct as 12th-placed Richmond fight to keep their finals hopes alive.
Tigers interim coach Andrew McQualter last week backed the physical ruckman's style of play and Nankervis on Monday said he has apologised to Lloyd via text.
"It's obviously disappointing for me, I never want to see anyone concussed," Nankervis told the Nine Network.
"Absolutely I have (let the team down). As the leader of the footy club that's not good enough.
"I need to be better than that and I take full responsibility for it."
Fremantle midfielder Caleb Serong and Essendon ruckman Andrew Phillips have until Tuesday to decide whether to challenge their respective one-match suspensions.
Serong was cited over a dangerous tackle on Carlton's Adam Cerra, while Phillips came under scrutiny for a high bump on Adelaide's Reilly O'Brien.
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