PORT Adelaide's Shaun Burgoyne will miss the next three matches after failing to beat his rough conduct charge at the AFL Tribunal on Tuesday night.

Port Adelaide argued that the contact with Hawthorn captain Sam Mitchell was accidental not negligent and that if it was adjudged negligent that it was low impact not high impact. The Tribunal did not accept this account of events and concurred with the Match Review Panel that it was negligent. However the Tribunal downgraded the incident from high impact to medium impact.

Burgoyne was offered a three-match stint on the sidelines if he had accepted the discount for pleading guilty, but the downgrade still means he will miss three matches, as the total activation points came to 225 and with 93.75 points hanging over from a previous charge, he has 318.75 points.

Burgoyne was charged after his contact with Sam Mitchell left the Hawks skipper unconscious on the Aurora Stadium turf.

Mitchell said on Monday that the contact was slight and that he was 'unlucky' to be knocked out.

In other Tribunal news from the weekend:

Shane Crawford, Hawthorn, accepted a one-match sanction for striking the Port Adelaide's Dean Brogan;

West Coast's Matt Rosa accepted a reprimand and 93.75 points towards his future record for striking Matt Campbell of North Melbourne;

Kyle Reimers of Essendon accepted a $1950 sanction for making negligent contact with umpire Michael Avon; and

Fremantle's Dean Solomon accepted an $1800 sanction for wrestling Tom Williams of the Western Bulldogs who has accepted a $900 sanction for the same incident.