Rabbitohs count the cost of their hard-fought 18-10 win over Wests Tigers.
Mitchell was placed on report for a high shot on Luke Garner as the Tigers mounted a late fightback and may also have to answer over a swinging arm on Josh Reynolds off-the-ball in the opening minutes.
The South Sydney star took issue with Reynolds kicking wildly at a ball and collecting teammate Campbell Graham in the head, with Mitchell then running in and hitting the Tigers five-eighth on the chin.
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Souths play Newcastle next Saturday night and are already expected to be without prop Liam Knight after he suffered a sprained ankle during the warm-up.