Sydney Roosters coach Trent Robinson has accused the NRL and the players' association of failing to act to protect players from abuses of privacy and potential extortion attempts.

Robinson on Sunday called on the game's governing body and the RLPA to step in to prevent proliferation of further incidents after videos of Parramatta's Corey Norman and an unnamed Brisbane player were offered for sale to media outlets last week.

He believed the two bodies had not done enough to discourage such actions when the humiliating footage of Roosters halfback Mitchell Pearce with a dog was aired on television news in January.

He suggested legal action should have been taken.