Hawthorn star Cyril Rioli admits frustration was behind his moment of madness which cost him a two-game AFL suspension.

Rioli will be sidelined for the important games against Sydney and Melbourne after he was twice found guilty of offences against Port Adelaide's Nick Salter at AAMI Stadium last Saturday.

Rioli pleaded guilty on Tuesday morning to striking Salter, but challenged at the tribunal a charge of attempting to strike the Port player in a bid to limit his penalty to one game.

That ploy failed when he was found guilty of the second charge on Tuesday night, despite the tribunal jury spending 30 minutes on its deliberations.

Rioli said he was the one to blame for his 30-second brain snap during the third quarter, when he angrily grappled with Salter and made contact with one punch but missed with the next.

"I take full responsibility for my actions and as a consequence of that I'll be out for two weeks," he said after his hearing.

"I just let my frustrations get the better of me and it won't happen again."

Player advocate Chris Townshend argued Rioli should have been spared a second suspended game because it was wrong to single out one arm swing that did not connect amid a melee involving nine players.

Townshend said justice had already been served by Rioli being suspended for striking.

"Why charge with missing when there is the available charge of striking?" he asked the jury.

But AFL legal counsel Jeff Gleeson said Rioli's attempted strike followed immediately the punch that connected, although it was one of the rare occasions where the young star did not achieve what he intended.

"The blow was delivered with intent, it just wasn't landed with precision," Gleeson said.

Rioli's suspension came on top of Hawthorn's shock loss to Port, which left the Hawks (sixth) just half a game ahead of Carlton and the Swans.

Rioli was also fined $1200 for engaging in a melee, along with Hawks Jarryd Roughead, Brad Sewell and Chance Bateman, and Salter and his Port teammates Dean Brogan, Paul Stewart and Robbie Gray.

Hawk Brent Renouf was fined $2100 because it was his second offence.

West Coast defender Eric Mackenzie escaped with a reprimand by pleading guilty to striking Fremantle's Michael Johnson during Sunday's derby at Subiaco Oval.

Fremantle's Adam McPhee and Stephen Hill and West Coast pair Patrick McGinnity and Scott Selwood were all fined $900 for wrestling.

Brisbane Lions full-forward Brendan Fevola was fined $3000 for a putting Melbourne's Colin Garland in a headlock last Saturday night at the Gabba.

St Kilda's Sean Dempster was fined $900 for making negligent contact with an umpire last Friday night at Etihad Stadium.

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