The head of the A-League admits he still has concerns about the sustainability of the Newcastle Jets, but insists Nathan Tinkler's plans to become chairman is a good thing.

Damien de Bohun yesterday pored over the club's financial documents, and met with key staff to discuss last week's shock resignation of both the CEO and chairman.

He said he has spoken with owner Nathan Tinkler over the last few days, and is pleased he no longer wants to sell the Jets.

Mr de Bohun said in the next few days Football Federation Australia officials will write to Tinkler to outline their concerns.

"It's fair to say we do still have some concerns about sustainability and ongoing operations of the club," he said.

"At the same time, it's been pleasing in recent days that Nathan Tinkler has come out publicly and stated that he is going to have a more hands on role in helping run the club, as chairman.

"From his perspective, he's committed to injecting new capital and also making some key decisions in the coming days, such as the appointment of a new chief executive officer."

Mr de Bohun has refused to be drawn on the benchmarks Tinkler will have to meet in his bid to hold onto the Jets.

"Nathan knows from our conversation that we will come back to him in the coming days in writing, just to outline our perspective on how things look," he said.

"He's certainly got a view of where things will go to and there'll be some pretty clear requirements in that context.

"He's articulated a commitment to continue to invest in the club so let's work through that and get to that position and that's what we expect will happen in the coming weeks."