Geelong forward Steve Johnson will challenge a rough conduct charge at the AFL Tribunal on Tuesday night.

Steve Johnson will challenge a rough conduct charge at the AFL Tribunal on Tuesday night, although the Geelong forward has pleaded guilty to a separate report for tripping.

Johnson will miss Saturday's clash with Brisbane if he is unsuccessful in overturning the charge of rough conduct against Richmond captain Chris Newman during Sunday's match at Simonds Stadium.

Due to his existing bad record, Johnson could not have got the sanction lowered from one match to a reprimand with an early guilty plea.

But he was reprimanded and had 78 demerit points added to his record for tripping Tigers midfielder Daniel Jackson.

North Melbourne forward Lindsay Thomas will also appear before the tribunal on Tuesday night in a bid to overturn a three-match ban for a level three rough conduct charge from an incident that left Sydney speedster Gary Rohan with a broken leg.

St Kilda key forward Justin Koschitzke has accepted a one-match ban for striking former teammate Zac Dawson in Friday night's clash with Fremantle.

Geelong's Trent West (rough conduct) and Sydney's Ted Richards (striking) have both pleaded guilty to incidents from round three and been reprimanded.

Greater Western Sydney defender Chad Cornes ($1800) and Adelaide's Matthew Jaensch ($900) have been fiend for wrestling with each other.