The agency, which comes under the Corporate Affairs Ministry, has been probing allegations of fund diversions at the company since last year.
According to the source, Singal was questioned by the SFIO in the national capital in the matter related to alleged siphoning of huge amount of funds.
The diversion of funds is estimated to be more than Rs 1,000 crore, the source added.
Calls made to Bhushan Steel officials for seeking comments remained unanswered.
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In recent weeks, the SFIO has been asked to investigate a significant number of companies for fraudulent activities, especially those related to diamond merchants Nirav Modi and Mehul Choksi in the Rs 12,700 crore Punjab National Bank fraud.
Last month, the ministry ordered the SFIO to probe around 110 companies and about 10 limited liability partnerships related to Modi and Choksi.
Besides, the white collar crime investigation agency has already questioned various bank officials with regard to the scam.