Party spokesperson Rajendra Chowdhury dubbed Mr Singh as a "back stabber who has no ideology."
"Saying that we are taking Singh back is nonsense and misleading. While in SP, Amar Singh had taken decisions in self-interest without taking high command in confidence due to which party had suffered loss and earned bad name in the past. The party will not allow him to repeat his misdeeds by taking him back," Mr Chowdhury said.
"People like Amar did not have any ideology. They only know how to fulfil their interests. He was expelled due to his anti-party activities after which he made baseless allegations against the party leadership and tried to botch political prospects of SP during Assembly polls," Mr Chowdhury said.
"After elections, he (Amar) was not in a position to show his face," Mr Chowdhury said, adding that there should be no doubt in anyone's mind that "back stabber" like him would be taken back in SP.
A section of the media had earlier speculated Amar Singh's re-entry in the party after the state government handed over inquiry of embezzlement of funds against him to Kanpur Police.