Prespakis found guilty at AFLW Tribunal

'We call him dad': How Burke is leading the AFLW Dogs (1:07)

AFLW star Ellie Blackburn shares why coach Nathan Burke's pivotal relationship-building skills has rubbed off on the Western Bulldogs playing group. (1:07)

Geelong star Georgie Prespakis will miss the next two matches after failing at a marathon AFLW Tribunal session to overturn her ban for a dangerous tackle.

Prespakis was slapped with a two-match suspension for the tackle, which concussed St Kilda ruck Erin McKinnon.

Both of McKinnon's arms were pinned in the tackle, and her head slammed into the turf when she was brought to ground.

She lay motionless for about a minute before being subbed out with concussion.

McKinnon, who has a history of concussion issues, is expected to miss the next two to three matches.

The incident was assessed as careless conduct, high impact, and high contact.

Prespakis pleaded not guilty, with her lawyer Gayann Walker also arguing for the impact to be downgraded from high to low as part of an alternate case.

Both arguments were rejected by the three-person jury, who took almost two hours to decide on their verdict.

Prespakis defended the way she brought McKinnon to the ground.

"Not at all am I trying to sling her. I'm just riding it down with her," Prespakis said during her evidence .

"It's difficult for a person of my size to fully control a person of her size.

"I believe my right arm has an intent to be grabbing at the football, not the player.

"If I had (my arm) any higher, it would affect her head or get her high around the neck."

Prespakis said she tried to bring McKinnon to the ground in the safest way possible.

"Even in this circumstance I manned the mark, and I was hoping she was OK and hoping she could play on," she said.

AFLW Tribunal chair Renee Enbom was satisfied the rough conduct charge and the high impact grading should stand.

It means Prespakis will miss crunch games against the fifth-placed Western Bulldogs and 10th-placed Essendon.

The Cats sit sixth with a 3-2 record.

Earlier in the evening, Essendon failed to overturn a one-match ban handed to forward Daria Bannister.

Bannister's slinging tackle on Collingwood captain Steph Chiocci was assessed as careless conduct, high contact and medium impact, ruling her out of Sunday's match.

Jeremy Whelen, acting for Bannister, argued the tackle should have been downgraded to low impact, which would have resulted in a fine instead of a suspension.

Chiocci herself accepted a one-match ban for her retaliation in which she struck Bannister in the throat.

Whelen argued Bannister took the heat out of the tackle halfway through once the ball spilled out, and that Chiocci's arms were free by the end of the movement.

"There's a heavy tackle here with a spinning motion," Whelen said.

"But it wasn't the lifting and dumping action. It wasn't the violent driving-into-the-ground tackle."

Nick Pane, acting on behalf of the AFLW, said the tackling action had the potential to cause a serious injury.