Pressure on the Manly Sea Eagles over alleged breaches of the salary cap continues to mount after the National Rugby League's integrity unit this week commenced formal interviews of club officials.

Revelations that several high-profile Manly players may have taken secret benefits or payments in cash, in breach of salary cap rules, came to police attention during Strike Force Nuralda's long-running investigation into match-fixing allegations.

Sea Eagles players.

The police investigation centred around four games involving Manly - three in 2015 and one in April 2016.

While detectives from the NSW Organised Crime Squad found no evidence of an organised conspiracy involving players fixing matchers, they did uncover a widespread trade in leaking of inside information from club insiders to punters. This is a criminal offence punishable by up to two years in jail. No charges will be laid as there is a six-month limitation from the date of the alleged offences occurring.