The Opposition said Sreeramakrishnan should quit the Constitutional post because of his personal and suspicious connections with the gold smuggling accused.
The Assembly will discuss on Thursday a resolution moved by the Opposition demanding his removal.
The report which accused Sivasankar of indulging in nepotism and grave irregularities has been submitted to the chief minister for necessary action.
The case was registered by the central investigation agency based on a complaint filed by Anil Akkara, a Congress MLA representing the Wadakkancherry legislative assembly constituency.
The Customs officers in the state are believed to have received intimation in this regard from Delhi.
Ayyappan was responsible for charting out the speaker's daily programmes and travel-related matters.
Accused, with a lesser involvement in the crime but privy to the offence, can be recommended to be made approvers by the probe officer.
The names in the chargesheet include Swapna Suresh, Sarith, K T Ramees and Rabins K Hameed. Sandeep Nair has turned approver and, therefore, has been excluded from the chargesheet.
The ED has not yet obtained any evidence to impose the Prevention of Money Laundering Act against CM Raveendran.
Swapna, who has only Class X qualification, produced the fake certificate to get a job through a private consultancy at Space Park under the IT department.