Koroisau has been fined $15,000 by the NSWRL, which announced the sanctions on Wednesday afternoon, on top of the $35,000 fine and two-game suspension already issued by the NRL.
If selected again, Koroisau will need to convince the Blues board "he has earned the right to be once again trusted to uphold all of the standards, protocols and values of NSWRL".
Blues coach Brad Fittler recently said Koroisau would not necessarily have a line drawn through his name at the selection table in future.