BNP Standing Committee Member Khandaker Mosharraf Hossain will go to Singapore for treatment.
His son and the party's executive committee member Dr Khandaker Maruf Hossain confirmed the matter to Jago News.
He said, "A process is underway to take Abba (father) to Singapore."
Earlier on June 17, Khandaker Mosharraf was admitted to Evercare Hospital in Dhaka with chest pain.
After eight days of treatment, he returned home but will now go to Singapore as he did not recover fully.
KH/SU