The NRL's salary cap probe into the Sharks has uncovered discrepancies beyond the one it self-reported to the integrity unit as the club braces for another heavy sanction from head office, one likely to have implications on this year's squad.

On the same day James Segeyaro returned to Cronulla training in the hope of resurrecting his NRL career, it emerged the Papua New Guinea international has been given no guarantee his contract will be registered pending the outcome of the salary cap investigation.

Return: James Segeyaro. Credit:AAP

The NRL is poised to deliver its findings into the long-running probe after the Australian Rugby League Commission meeting on Thursday, which is expected to include a salary cap penalty as well as significant fine.

Worryingly for the Sharks, it's understood the NRL's forensic audit of the club's computer servers stretching back several years has revealed more than just the single salary cap anomaly chief executive Barry Russell reported in August last year.