The Government intends to require all public officers who visit casinos frequently or who purchase the annual casino entry pass to declare these actions, Deputy Prime Minister Teo Chee Hean said in Parliament on Monday.

Mr Teo was responding to questions by MPs after a spate of corruption cases involving public servants, including one involving an assistant director at the CPIB who has been charged with misappropriating $1.7 million to fund a gambling habit.

The Public Service Division is reviewing the rules on casino visits by all public officers, Mr Teo said.

There is currently no blanket rule prohibiting public officers from visiting the casinos, but agencies have imposed restrictions in cases where conflict of interests may arise.

Officers from the Casino Regulatory Authority and police officers working on matters involving the casinos are prohibited from visiting the two casinos except for official duties. Other police officers, Central Narcotics Bureau officers as well as Corrupt Practices Investigation Bureau (CPIB) officers have to declare a casino visit within seven days.

The PSD review currently underway will tighten the rules for all other public servants, Mr Teo said.

"PSD is currently working out the implementation details for these new rules to strike a balance between strengthening safeguards and imposing too many checks and rules on the system and public officers," he said.