The NIA had recently summoned former senior inspector Mehmood Mujawar of Maharashtra's Anti-Terrorism Squad (ATS) in Mumbai and recorded his statement, official sources said.
The sources said he had been asked to provide evidence about his claims made before the Solapur court that Ramchandra Kalsangre and Sandeep Dange are "no more".
Mujawar was suspended after a case under Arms Act and criminal intimidation was filed against him.
"Sandeep Dange and Ramji Kalsangra are in fact no more but are shown alive in Malegaon bomb blast case by high-ranking police officers," Mujawar had claimed in the court last December.
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They said a final decision on the veracity of the claims made will be taken after ascertaining these and it would be informed to the special NIA court.
A bomb strapped to a motorcycle exploded in Malegaon on September 29, 2008, killing seven people and injuring around 100.
According to the investigating agencies, the blast was carried out by right-wing extremists and 11 people including Lt Col Prasad Purohit and sadhvi Pragya Singh Thakur are at present in jail.
However, when the case was handed over to the NIA, the agency filed a supplementary charge sheet by which charges under MCOCA were dropped on the ground that there wasn't sufficient material.
The NIA charge sheet also dropped names of Thakur and five others from the list of accused. Apart from Thakur, those given clean chit by NIA are Shivnarayan Kalsangra, Shyam Sahu, Praveen Takkalki, Lokesh Sharma and Dhan Singh.