Jatiya Party Chairman HM Ershad is scheduled to undergo a cardiac surgery at National University Hospital in Singapore.
The physicians are likely to set a ring in his heart, said a party insider.
The Jatiya Party chief left Bangladesh for Singapore on October 16.
JP Secretary General Ruhul Amin Howlader, Barrister Anisul Islam Mahmud MP, Ziauddin Ahmed Bablu, Nasreen Jahan MP and Ershad's personal assistant Major (retd.) Khaled Akhter, among others, are accompanying him.
However, no family members were seen accompanying the former president.
Wishing anonymity, a number of party leaders expressed their shock and disgust over the absence of the family members of their party chief in this crisis period.