The Kangaroos have failed in their bid to clear tall utility Leigh Brown for Sunday's key AFL game against St Kilda.

Their appeal against his one-match striking ban was dismissed.

The Kangaroos had enhanced video footage for the lengthy appeal hearing, which lasted about 90 minutes.

Chief executive Geoff Walsh also addressed the three-man appeal panel, saying the club did not make frivolous appeals.

But after a 20-minute deliberation, board chairman Peter O'Callaghan said Brown's arm movement was consistent with a strike.

Brown was found guilty on Tuesday night after being booked on video evidence for striking Sydney tagger Brett Kirk during Saturday's dramatic SCG win.

Kirk gave evidence via telephone, saying he remonstrated with Brown after the incident because he was frustrated with not receiving a free kick.

Brown testified he was trying to keep Kirk away from Kangaroos ruck-forward Corey McKernan and had picked a spot below the Swan's shoulder when trying to lay the shepherd.

Meanwhile, the AFL will not make its own appeal against the tribunal after Wednesday night's not-guilty finding for West Coast onballer Daniel Kerr.

He was acquitted of headbutting Brisbane opponent Robert Copeland because the video evidence was inconclusive.

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