The sources said the agency has been carrying out exhaustive investigation into the scam in which lakhs of depositors were allegedly cheated by ponzi companies after promising higher rates of interest on their deposits.
They said the agency has not been able to find any material linking Supriyo to the scam yet.
Pal, arrested by the CBI for his alleged role in the Rose Valley chit fund scam, had alleged involvement of the Union Minister of State for Heavy Industries and Public Enterprises in the scam.
The Trinamool MP was arrested in Kolkata on December 30 and later taken to Bhubaneswar where a special court is hearing the Rose Valley scam case.
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Pal was one of the directors of the tainted chit fund group that allegedly duped investors in Odisha, West Bengal and some other states.
He has also been charged with giving senior posts to his family members in the company, a senior CBI official said.
In its charge sheet submitted in the court on January 7, CBI had accused the ponzi firm of duping investors of Rs 17,000 crore, of which Rs 450 crore is from Odisha alone. The company was active in Odisha and had 28 branches in the state.