Tuesday's AFL Tribunal session saw one case heard, with Port Adelaide's Willie Rioli contesting a two-game suspension for striking.

Rioli was charged by the AFL's Match Review Officer for an incident during the fourth quarter of Saturday's game against Collinwood that involved Magpies defender Nathan Murphy.

The incident in question occurred away from the game's play, with Rioli seen making contact with Murphy's head with his left hand.

Rioli's actions were assessed as intentional conduct, medium impact and high contact, resulting in a two-game ban for the Power forward.

Port Adelaide and Rioli decided they would challenge the charge at the AFL Tribunal in the wake of Round 19's results, hoping to clear or reduce Rioli's suspension.

The Power are scheduled to face Adelaide this Saturday before a matchup with Geelong in Round 21.

Rioli, Port Adelaide manage to reduce two-game suspension

Willie Rioli has seen his suspension for striking reduced to one game after the Tribunal assessed the level of impact as low, rather than medium. The incident was held as an intentional act, resulting in a halved suspension length. 

Rioli will be suspended for one game, missing his side's upcoming game against Adelaide before returning against Geelong in Round 21. 

Here's how the hearing played out...

Rioli pleaded guilty to the striking charge, with the Power arguing the forward's conduct was careless rather than intentional, while the level of impact was low rather than medium.

A reading of careless conduct, low impact and high contact would result in a fine rather than a suspension. If only one of the two arguments are successful, Rioli's suspension would be reduced to one game.

A medical report from Collingwood has confirmed Murphy will not miss any training or matches as a result of the incident.

A statement from Rioli says he intended to make contact with Murphy's chest in more of a pushing motion. Rioli apologised and said he did not intend to make contact with Murphy's head and that he made a mistake.

The AFL is arguing Rioli's conduct was intentional, with Rioli using a "half-clenched fist".

Port Adelaide representative Ben Krupka argued Rioli and Murphy were positioned close enough to play for the incident not to be considered an "off-the-ball" incident.

Krupka went on to suggest Murphy caused Rioli's arm to change its action/direction prior to making contact, with Rioli's arm raised as a result.

Evidence of prior striking incidents that were graded as low impact were used by Krupka, including Lance Franklin's strike on Trent Cotchin from last year.