He also said that he would help Amar Singh to "sail through" the crisis. However, there was no chance that the expelled leader could come back into the party, he said.
"We helped the government, now they (Rewati and Amar) are under probe," he said.
"(We are) not taking him back...he is facing injustice," he said.
"It is an injustice being meted out to Amar Singh. It is a conspiracy to trouble (SP Lok Sabha MP) Rewati Raman Singh and Amar Singh. He (Amar) helped Congress (during the 2008 trust vote) as Samajwadi Party voted in favour of the UPA. And now he is being questioned," said Yadav in a press conference in New Delhi.
"We only helped by voting in their (Congress') favour. Did we join the government? Did Amar Singh or Rewati Singh become ministers? Had money changed hands, I would have known about it," said Yadav.
In his reply to a question on whether political secretary, Congress President, Ahmed Patel should also be interrogated, "I don't know," said Yadav.
Meanwhile, Rewati Raman Singh will be interrogated by the Delhi Police in connection with the cash-in-vote-scam on Jul 25.