Tejashwi Yadav said his father was shifted from operation theater to ICU after the surgery.
RJD president Lalu Prasad's kidney transplant surgery on Monday in Singapore was successful, his son and Bihar Deputy Chief Minister Tejashwi Yadav said.
Yadav said his father, as well as elder sister Rohini Acharya, who donated one of her kidneys to the 74-year-old, were fine.
"After Papa's kidney transplant operation was successful, he was shifted from operation theater to ICU. My sister and donor Rohini Acharya and RJD National President (LaluYadav) both are healthy. Thank you for your prayers and good wishes," Yadav said in a tweet in Hindi.
He also heartily thanked his well-wishers for their prayers.