Jatiya Oikyafront Convener Dr Kamal Hossain is scheduled to return home from Thailand at midnight.
He, along with his wife Hameeda Hossain, is scheduled to land at Hazrat Shahjalal International Airport at around 12:50am.
He will be landing in a Thai Airways flight, Gonoforum central leader Rafiqul Islam Pathik confirmed The Daily Star.
Pathik also said Kamal Hossain, also president of Gonoforum, went to Thailand from Singapore after treatment there.
Earlier on January 19, Kamal Hossain went to Singapore for medical purposes.