Special judge N K Malhotra allowed the Enforcement Directorate (ED) to interrogate Bhaskararaman till February 26 after the agency said he was required to be quizzed for seven more days.
ED's special public prosecutor Nitesh Rana said the accused needed to be confronted with various documents recovered during the probe which was at a very crucial stage.
Bhaskararaman, who was arrested from a five-star hotel in the heart of the national capital last Friday, was produced before the court after expiry of five-day ED custody.
The ED had earlier claimed that during the course of investigation, it was revealed that Bhaskararaman, a qualified chartered accountant, had been assisting Karti to manage his "ill-gotten wealth" in India and abroad.
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The agency had said the investigation required the presence of Bhaskararaman for collecting vital evidence and other information which was within his special knowledge and exclusive domain.
To wriggle out of the situation without any punitive action, INX Media entered into a criminal conspiracy with Karti, the ED has alleged.
The FIPB unit of the finance ministry not only granted the illegal approval but also misinformed the investigation wing of Income Tax Department, it claimed.