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CBI sources said as its officials were scrutinising the documents they found a letter written by Patnaik requesting for a relook and reverse rejection of Hindalco's application for Talabira II block in Odisha.
CBI said while no final decision has been taken as to who all would be questioned, the sources said the Chief Minister would be questioned only if need was felt to seek his views on the reasons for recommending coal blocks to Hindalco.
CBI sources said 46-year-old Kumar Manglam Birla, chairman of Aditya Birla Group, had written a letter to the Prime Minister's Office which had forwarded the letter to the Coal Ministry.
CBI has alleged in its FIR after rejection of Hindalco's plea in 2005, Birla wrote two letters and held a "personal meeting" with the then Coal Secretary P C Parakh, after which a decision was reversed and Hindalco was given the block which was earlier meant for two Public Sector Undertakings--Mahanadi Coal Fields and Neyveli Lignite.
The allegations have been denied by Hindalco and Parakh.
The former Coal Secretary has said if he was a conspirator, so was Prime Minister as he had signed the allocation letter to Hindalco.
The agency, in the meanwhile, has started scrutinising the documents recovered from searches at the five offices of Hindalco and residence of Parakh in Hyderabad on October 15.
The sources said the agency would question Birla and Parakh in connection with the case but that might take time as CBI officials would first examine the documents to gather material evidence.
Sources said the FIR is the first step and all the allegations would be probed during the course of investigations. They said the agency has named people in the FIR only on the prima facie evidence basis and further investigation is going on.