The penalties, which also include forgoing any potential Origin match payment, come after Tamou was arrested and charged for high range drink driving and driving without a licence.
NRL Chief Executive, Mr Dave Smith, said the facts were not in dispute and the penalties reflect the seriousness of the offences.
“This is a high level, high risk, high penalty situation,” Mr Smith said today.
“Drink driving puts lives at risk. Our players are well educated regarding alcohol management and there is no excuse for such behaviour.
“Our Integrity Unit has reviewed the situation, we have consulted with the Cowboys and we have sent a clear message of what is expected of our players.”
The NRL will also work with the Cowboys and Tamou to implement additional education and welfare programs, including responsible driver education.