AAP has been told the Rabbitohs were informed on Wednesday Mitchell, sidelined with a foot injury since round 18, would at this stage serve his one-game ban in 2025.
But the Rabbitohs were still in talks with the NRL on Wednesday evening attempting to sway the league, which had not publicly announced a formal decision.
Souths submitted testimony from three doctors, who had cleared Mitchell as fit to return from his foot injury, while arguing he should serve his ban during the round-27 game against the Sydney Roosters.
At this stage, the suspension looks set to continue to hang over Mitchell, who also received a $20,000 fine from the NRL for being pictured with a white powder in a Dubbo hotel room last month.
Mitchell is unlikely to be permitted to serve the ban during the post-season Pacific Championships after Australia coach Mal Meninga said last month his injury woes would preclude him from selection.
Latrell Mitchell has been issued with final breach notices from both the NRL and the Club, and he has accepted the sanctions which were finalised today.— South Sydney Rabbitohs � (@SSFCRABBITOHS) READ MORE: https://t.co/LM2EJmAW3r pic.twitter.com/O3WwszTNyQAugust 29, 2024
As part of sanctions finalised last Thursday, the NRL left it up to Souths doctors to determine when Mitchell would be fit to return from his foot injury and therefore serve his ban.
Rabbitohs interim coach Ben Hornby had initially flagged the injury would be season-ending, likely leaving any suspension to hold over until 2025.
But Hornby backtracked on the morning Mitchell's sanctions were finalised, claiming the fullback could actually be fit for the last round of the regular season.
Mitchell enjoyed a triumphant return to Origin in game two, but it was otherwise a frustrating year. (Joel Carrett/AAP PHOTOS)
Suggestions Mitchell could serve the ban while under an injury cloud had raised eyebrows.
"I don't think it's a loophole," NRL chief executive Andrew Abdo said on Wednesday morning.
"An off-field suspension should be served when the player is fit and available to play so he's actually missing a match, particularly if the suspension has occurred post-injury.
"So it's not a loophole. We'll look at it, work with the club and then make our decision."
Mitchell rode an exercise bike at Souths training on Tuesday and did not participate in the field session, but the club was confident he would be allowed to serve his ban this season.
With those hopes likely to be dashed, Mitchell cannot be rushed into the team to face the Roosters without permission from the NRL, given he was not named in their extended squad on Tuesday.
In addition to the NRL's sanctions, Souths fined Mitchell $20,000 over the white-powder incident and will impose an additional $80,000 penalty if he reoffends.
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