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South Sydney face an anxious wait with the NRL looking into the Rabbitohs playing with an extra man for roughly 30 seconds in the round-nine win over Brisbane.
In the 53rd minute of Friday's match at Suncorp Stadium, State of Origin representative Jai Arrow came on as a replacement for Thomas Burgess.
But the English prop remained on the field, participating in tackles before leaving shortly thereafter.
An NRL spokesperson confirmed to AAP the league will review the ground manager's report before deciding what action to take.
Canterbury were stripped of two competition points for a similar breach in a 2009 defeat of Penrith after Ben Roberts, the last replacement player to take the field, scored the match-winning try for the Bulldogs.
But given the Rabbitohs' breach did not take place in a try-scoring situation and had no impact on the eventual result, the NRL's punishment may be less severe.
The Broncos were in possession for the majority of the alleged breach but Burgess did take a hit-up before leaving the field.
The Rabbitohs had already assembled a 22-6 lead at the time of the breach, before running out 32-6 victors.
The NRL's head of football Graham Annesley will address the incident in his weekly briefing on Monday.
