Transparency International Fiji says the Independent Commission Against Corruption, or FICAC, must be seen to be actively investigating claims of government corruption.
Documents leaked on blog site Fijileaks last week, which appear to come from FICAC, say the former health minister Neil Sharma manipulated a tender process, and recommended that he be charged with conspiracy and abuse of office.
FICAC has declined to comment on the authenticity of the leaked documents.
It now says it is investigating the ministry but refuses to disclose when the probe was launched, what the suspected breach is or when the investigation is expected to be finalised.
Transparency's executive director, Apisalome Tudreu, says FICAC has a responsibility to complete a thorough investigation.
"If this is going to encourage trust in our system, then they will have to appear like this is being done actively to complete the process and reach the final decision. At the end of the day of course it's the reforms to make sure these kind of practises do not recur."
The Director of Public Prosecutions could not be reached for comment on the leaked FICAC recommendation.