Police will be out in force at Friday night's NRL final between arch-rivals Parramatta and the Bulldogs to ensure the tensions on the field do not spill out into the crowd.

The match is expected to attract a record-breaking crowd of more than 70,000 fans.

Bulldogs fans have been involved in some ugly crowd behaviour in the past, including an incident in April which left a security guard bloodied and a man being issued with a life ban.

Assistant Commissioner Denis Clifford said police were preparing for a grand final-like event and were ready to crack down on any bad behaviour.

"Obviously we do a risk assessment before every NRL game about the size of the crowd, previous incidents we may have had between the clubs," he told reporters on Thursday.

"We'll have sufficient police and private security in and around the ground to deal with anything that occurs there and to jump quickly onto anyone who misbehaves.

"They'll be at the very least put out of the ground and may face criminal charges."

Extra train and bus services will be running to accommodate the huge crowd expected to travel to and from Sydney Olympic Park.

Fans will also be able to use their tickets for the game for travel on trains and buses.

Transport Minister David Campbell said police and transit officers would also have a strong presence on all public transport.

"They'll ensure those who are stupid enough to do the wrong thing in terms of criminal or anti-social behaviour are likely to be caught," he said.

"They're likely to be charged and finish their night in the back of a police car."

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