A defiant Andrew Wilkie is weighing up whether to fulfil his threat to withdraw support for the government as speculation mounts he may be double-crossed on his poker machine reform deal.

It's believed the proposed controversial mandatory pre-commitment reforms could be delayed until 2016 at the earliest.

For a third day in a row Prime Minister Julia Gillard has refused to publicly support the measures.

She told reporters in Melbourne on Wednesday her government remains committed to tackling problem gambling but she would not confirm reports of a compromise deal with Mr Wilkie.

"I'm not intending to engage in a running commentary on discussions with Mr Wilkie whilst I am in those discussions," Ms Gillard said.