St Kilda will be without big man Justin Koschitzke for their next three AFL games through suspension after he pleaded guilty to a rough conduct charge.

Koschitzke had been reported for a high bump on Sydney's Nick Malceski at ANZ Stadium last Saturday night and will now miss games against North Melbourne, on Saturday, Collingwood and Fremantle.

Fellow Saint Brendon Goddard also took an early guilty plea on Tuesday after being reported from the game, and was fined $900 for making negligent contact with a field umpire.

The guilty pleas mean the tribunal will not sit on Tuesday night.

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