Brisbane celebrated on Tuesday night after forward Jonathan Brown was cleared of a rough play charge at the AFL tribunal.

Brown was found not guilty of engaging in rough play against St Kilda's Jason Blake at the Gabba last Friday night and is now clear to play in the preliminary final the weekend after next.

The tribunal ruled a rough play charge could not be sustained as play had stopped before the umpire laid the report.

Field umpire Stephen McBurney on Tuesday night confirmed he had laid the charge after the quarter-time siren had sounded.

Brown's defence advocate Sean Carroll argued a rough play charge was inapplicable because play had stopped.

"How can a player be involved in an act of rough play if there's no play taking place?" Carroll asked the tribunal.

The three-member tribunal panel deliberated for 20 minutes over Brisbane's submission before ruling there was an ambiguity and dropping the charge.

Earlier, Geelong forward Kent Kingsley was suspended for one week for striking Port Adelaide's Chad Cornes.

Kingsley will miss Saturday's semi-final against Essendon at the MCG.

However Kingsley will be available to play against Brisbane should the Cats beat the Bombers.

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