Top CBI sources said the agency is most likely to file the charge sheet in the case tomorrow.
The decks for filing of charge sheet were cleared after Attorney General Mukul Rohatgi opposed the stand taken by CBI Director Ranjit Sinha that further probe should be carried out in the matter.
In his opinion, Rohatgi had said that the available material with CBI is enough to prosecute Dayanidhi and his brother Kalanithi Maran in the Aircel Maxis case.
The probe team was of the view that enough evidence was available to indicate the role of Marans while Sinha differed with its stand.
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The sources said the matter remained pending with the then Attorney General Goolam Vahanvati during the tenure of the previous UPA-II government.
CBI in 2011 had filed its FIR in the case alleging that the then Telecom Minister Dayanidhi Maran had used his influence to help Malayasian business tycoon T Ananda Krishnan acquire Aircel by allegedly coercing its owner Chinnakannan Sivasankaran.