Indian mining giant Adani says engineering firm AECOM's decision to "demobilise" from its Carmichael project is a result of the contractor completing its obligations.
AECOM, the firm designing the $2.2 billion rail line to its coalmine in Queensland's Galilee Basin, announced on Wednesday it had "completed the current phase of design work" and no longer had any staff working on the project.
That led to a report by the Guardian suggesting AECOM had joined Downer EDI in parting ways with Adani.
Downer and Adani mutually agreed to cancel a conditional $2.6 billion contract in December after Queensland Premier Annastacia Palaszczuk vetoed a concessional federal government loan bid.
Adani said the decision to part ways with Downer was "simply a change in management structure" in the wake of Ms Palaszczuk's announcement.
In relation to AECOM, however, Adani says it retains a commercial relationship with the company, describing its decision to pull staff from the project as normal business practice.
"AECOM remains an important partner for Adani and we appreciate the quality of work they have completed to date and look forward to continuing to work with them," an Adani spokeswoman told AAP on Thursday.
"It is normal for contractor numbers to change through the life of a project as milestones are reached and stages of work are completed."
The veto of the Northern Australia Infrastructure Facility (NAIF) loan has raised question marks over Adani's ability to finance the Carmichael mine, but the company says it remains "100 per cent committed" to the project.
Environmental group Greenpeace says Adani is trying to gloss over the situation and has called on the company to cut its losses and abandon the project.
"While Adani digs its heels in and pretends all is well, they continue to make promises that they can never deliver," Greenpeace Australia's Jonathan Moylan said.
"Most corporations would have walked away a long time ago given the strident opposition of the Australian people and lack of finance."
Meanwhile, anti-Adani protesters confronted Prime Minister Malcolm Turnbull as he addressed a crowd of locals east of Brisbane on Thursday.