More than 800,000 migrant workers have been registered so far, junta chief Gen Prayuth Chan-ocha said Friday night.
During his weekly TV programme, Prayuth said the junta is working with neighbouring countries, such as Cambodia, Myanmar, and Laos in making preparations and conducting the nationality verification process again in order to legally issue passports for the those migrants.
"We have set a clear timetable to properly manage the workers and prevent human rights violation problems," Prayuth added.
"Registration will be available for migrant workers only until 31 October 2014. After that will be the nationality verification process, which will be conducted and completed by 31 March 2015."
He said business operators should also inform the authorities of their demand for migrant workers.