"This is true that I had talked about defeat of two sons of Lalu Prasad in Bihar elections and also said of quitting politics if they did not loose...Definitely this claim was 'amaryadit' (undignified)," he said in his facebook account.
"I should not have uttered such things for sons of any politician. I am hurt for making undignified claim and express sorry before you all," he said.
His party JAP had contested 101 seats in the recently concluded Bihar poll but drew a blank.
On being asked whether he would like to go back to Lalu Prasad's party, the leader answered in negative.
"Going back to old option is not possible for me," he told PTI over phone while ruling out a return to RJD.
Talking about his future course of action, Pappu Yadav said he would try to enact role of a true opposition to Nitish-Lalu government in Bihar.