Manly has been slapped with a $10,000 fine for coach Geoff Toovey's post-match blow up on Friday night, deemed by the NRL as excessive criticism of the referees.
Toovey unleashed an almighty spray towards the game's officials at the media conference after the Sea Eagles were over-run by South Sydney in going down 22-10 in Gosford.
No official was spared as Toovey questioned a no-try ruling against Steve Matai, the penalty count against his side as well as separate acts of foul play involving Souths pair Jeff Lima and Greg Inglis.
The five-figure fine handed down on Monday comes in the form of a breach notice, which the Sea Eagles have five days to appeal.
NRL head of football Todd Greenberg said Toovey crossed the line with his emotional reaction.
"I accept that emotion is a big part of our game but that is not an excuse for making unwarranted attacks on match officials," Greenberg said in a statement.
"There needs to be a balance between coach's expressing their opinions and their emotions and showing respect for the game and the match officials in that process."
Under NRL rules, excessive criticism is deemed as moving beyond identifying perceived errors and making an emotional attack on match officials.
During his outburst, Toovey questioned whether the two whistleblowers appointed to the glamour match were the best the league had.
In a statement likely to only infuriate Toovey further, referees boss Daniel Anderson backed the performance of whistleblowers Shayne Hayne and Henry Perenara as well as video referee Steve Chiddy.
Toovey was left dumbfounded when the video referee failed to overturn a held-up call by Perenara when Matai claimed a try.
Replays failed to show any conclusive proof that the ball had been grounded in-goal.
"The performance of the match officials in a fiercely contested game on Friday night was very good," Anderson said.
"With the Steve Matai ruling, the officials followed the proper procedures in the video review process and arrived at the correct decision.
"The referee on the field ruled the player grounded the ball short and was then held up and there was insufficient video evidence to warrant over-ruling that decision."
