According to court sources, retired scientist Nambi Narayanan's complaint is expected to be taken up for hearing tomorrow before a magisterial court.
In his petition, Narayanan has claimed that Sreekumar had made false statements against him to tarnish his image.
Sreekumar had last year filed a similar complaint against Narayanan, Gujarat Chief Minister Narendra Modi, BJP President Rajnath Singh and party's spokesperson Meenakshi Lekhi over the alleged attacks on him in the 1994 ISRO spying case.
In his plea, Narayanan alleged Sreekumar had given "vexatious statements" against him during a debate on a news channel in November last year and the former IPS officer had also filed a "politically motivated false" criminal defamation complaint against him and others before a court here.
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In his letter, Narayanan claimed Sreekumar, who was then serving as Deputy Director in the Subsidiary Intelligence Bureau, Thiruvananthapuram, and was in-charge of the probe into the espionage case, had allegedly falsely implicated him in the case.