SYDNEY key defender Tom McCartin will miss his side's elimination final through suspension unless the Swans successfully challenge his ban at the Tribunal.

McCartin's season might be over after his high bump on Adelaide's Shane McAdam earned him a two-game ban for rough conduct.

The Swans defender and McAdam were going for the ball in the frenetic last term of Saturday night's controversial one-point Sydney win when they collided.

McAdam was laid out in the incident, which was graded careless, high impact and high contact.

It means McCartin will miss the game against Melbourne in the final round of the home and away season as well as Sydney's first final in a huge blow to the Swans' hopes of going deep into September.

Geelong veteran Mitch Duncan is the latest player punished under the AFL's season-long crackdown on dangerous tackles.

With the reigning premiers out of finals contention, Duncan's season is over after he was suspended for one game over his sling tackle on Jack Higgins.

Duncan slung Higgins across his body and into the turf at Marvel Stadium on Saturday night, with the tackle conceding a 50m penalty as it came moments after the umpire had blown the whistle for a seperate free kick.

It was graded careless, medium impact and high contact.

He will miss next week's game against the Western Bulldogs, which will be Geelong's last of the season.

Duncan's suspension comes on the same weekend Collingwood's Beau McCreery was also offered a one-game ban for a dangerous tackle on Brisbane's Darcy Wilmot.

While the Magpies might still opt to appeal the ban at the Tribunal, McCreery is currently sidelined for Friday night's match against Essendon.

If the suspension stands, McCreery would return for the Magpies' qualifying final.