The Daily Star quoted sources as saying that the repatriation was likely to begin from February next year.
As per an initial agreement, signed on November 23, the two countries were supposed to form the JWG within three weeks. But they failed to set it up by the December-14 deadline due to procedural complexities.
More than 655,000 Rohingyas have crossed into Bangladesh since August 25, escaping a military crackdown in Rakhine state, which many countries and human rights bodies have described as ethnic cleansing.
The military action was triggered after their posts became targets of terrorist attacks.
There is global outrage over the distressing plight of dispossessed Rohingya in Bangladeshi camps currently.
On October 12, a United Nations' report based on interviews conducted in Bangladesh found that brutal attacks against Rohingyas in the northern Rakhine state have been well-organised, coordinated and systematic, with the intent of not only driving the population out of Myanmar, but preventing them from returning to their homes.