The government-appointed three member panel of lawyers cleared Governor Arjuna Mahendran but found several flaws in the conduct of bond sale by the bank's Public Debt Department (PDD).
A press release issued by the Prime Minister Ranil Wickremesinghe's office said that while contending that Mahendran bore no direct responsibility for the decision, his son-in-law's firm's role in the bond trading warrants further investigation.
It was alleged that Mahendran's son-in-law's firm had benefited from inside information on Central Bank's decision to sell 10 billion rupees (USD 76 million) worth of bonds at a higher rate of interest in place of the original decision to sell just 1 billion worth of bonds at a lower interest rate.
The panel said the decision had been arrived at by the bank's PDD. Its tender committee comprises eight members but Mahendran was not among them.
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However, the panel also observed that Mahendran's son-in- law's company's "unusual role" needs to be investigated further.
Mahendran was appointed by the newly-elected government of President Maithripala Sirisena and has been on leave since the panel's investigation started last month.
Mahendran was subsequently quizzed by the anti-graft commission and he was slapped with a travel ban until the investigation could be completed.