Dr Ruto has kept silent since the storm over the alleged murder plot rocked the government.
He is also yet to file a formal complaint against central Kenya Cabinet secretaries, principal secretaries and parastatal heads adversely mentioned in the claimed scheme.
On Wednesday, the DCI denied claims that he had approached the Deputy President to record a statement and said that he had not yet spoken to him.
Deputy President William Ruto has refused to field questions from journalists over an alleged plot to assassinate him.
Dr Ruto on Thursday ignored requests from reporters to talk on the matter after a press conference on female genital mutilation at his Karen residence office in Nairobi.
