GWS gun Toby Greene is set to miss this week's blockbuster against the Western Bulldogs after vision shows him headbutting an opponent.
The behind-the-goals video captured the small forward collecting Isaac Heeney with his forehead - as reported by the nearby umpire.
According to the AFL website analysis of the incident:
If the MRP deems there was sufficient force in Greene's actions to constitute a report, it is likely to be graded intentional conduct with at least low impact to the head, resulting in a one-match ban.
In the event the impact was graded as medium, Greene would miss two matches.
Greene has a poor record with the MRP, having been sanctioned twice this season already.
Here is the incident in question: