Prime Minister Prayut Chan-o-cha on Friday reiterated his decision to stick to his existing plan to end his tenure once new elections are held.
Gen Prayut said the government and the National Council for Peace and Order (NCPO) would hand over the work on any unfinished reforms to a new government formed after the poll.
"We will do what we can on reforms and hand over the baton after the third phase and that is elections," he said on his weekly television programme, Returning Happiness to Thai People.
"Whether the next government will continue [the reforms] or not is up to it. I will do as much as time on the roadmap permits," he added.
Some supporters of the junta in recent weeks have floated the idea of extending its tenure — possibly by up to two more years — until there is a certainty that the many reforms it wants to carry out have taken hold.
An election had been expected early next year but a delay is now certain as the draft constitution will be put to a public referendum, tentatively planned for Jan 20.
The new poll could be delayed further if voters in the referendum are also asked whether they would prefer reforms before the poll is held.
Gen Prayut has kept the public guessing about his intentions since June 4 when he said he would continue in power to push for reforms "if everyone wants me to stay on".
But government spokesman Maj Gen Sansern Kaewkumnerd on Sunday denied any such intention, saying the prime minister would remain only as long as needed in line with the roadmap developed by the NCPO.