Auckland Transport is pursuing tens of thousands of dollars in disputed payments after a long-running investigation.
Communications manager Wally Thomas confirmed it is "in discussion with external parties" about recovering the funds.
The Serious Fraud Office is refusing to say if it is any closer to laying charges as the first anniversary of the case approaches.
Last August, Auckland Transport said it was investigating "allegations relating to the potential misuse of public monies" in its road contracts division.
Senior managers, Murray Noone and Barry George, left Auckland Transport as the Serious Fraud Office also launched an investigation.
Auckland Transport is understood to have sought the costs of a PriceWaterhouse Coopers investigation from the two men.
The public transport agency is also pursuing contractors, including Projenz, for payments. Director Steve Borlase said Projenz was unable to comment.
Since the investigation began, contractors have spoken of a culture of backhanders and deal sweeteners being rife in the awarding of roading contracts.
A Serious Fraud Office spokeswoman said the investigation was ongoing.
"Auckland Transport has advised the Herald on Sunday on a number of occasions that issues regarding road corridor maintenance area of the business are under investigation by the SFO and that it is unable to comment further. That remains Auckland Transport's position."