Roosters recruitment manager Peter O'Sullivan has copped an indefinite ban after the NRL deemed he wasn't a fit and proper person for registration.

The sanction against O'Sullivan, one of the best talent spotters in the game, relates at least in part to his association with notorious punter and brothel owner Eddie Hayson.

Big player: O'Sullivan has been credited with bringing exciting fullback Latrell Mitchell to the Roosters. Credit:Getty Images

Hayson, who deposited more than $700,000 in O'Sullivan's TAB account over a number of years, denied he ever gained any financial benefit from their friendship.

O'Sullivan has been sidelined since mid-August, with the NRL opting to suspend him after he responded to an intention to cancel his registration. It's understood O'Sullivan is considering whether to appeal the decision.