Bulldogs football manager Garry Hughes became the first casualty of the club's sex scandal, sacked for failing to enforce its code of conduct and for "not acting in players' interests".

Bulldogs chairman Doctor George Peponis announced the decision following a marathon board meeting at the club's Sydney headquarters.

Dr Peponis also announced two players had been fined - $10,000 and $5,000 - and several others had been given suspended $5,000 fines for their failure to adhere to dress codes when interviewed by police.

Police spoke with the players at the Sydney Police Centre earlier this month in relation to allegations of sexual assault arising out of an incident in Coffs Harbour on February 22.

Dr Peponis declined to reveal which players had been fined and to elaborate on the exact reasons for Hughes' sacking, only saying he had paid the price for the players' failure to adhere to the code of conduct "as a whole".

It's understood Hughes was dismissed for the players' failure to adhere to the code in Coffs Harbour as well as their inappropriate dress in Sydney.

Several players attended those police interviews dressed in shorts, t-shirts and thongs despite a management directive to wear more appropriate attire.

Two players wore shirts which featured the phrase "we play dirty".

"Garry Hughes, as the manager, was responsible to ensure the code of conduct was adhered to," Dr Peponis said.

"We don't believe that was enforced."

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