The Department of State Services has commenced the screening of ministerial nominees sent to it by President Muhammadu Buhari, the Punch reports.
It was gathered that no fewer than 20 nominees had been vetted by the DSS operatives since the exercise started.
The President was said to have sent to the agency a total of 36 names of would be ministers for security checks.
The identities of the nominees were top secret as of Wednesday.
The President had indicated in a chat with journalists in Accra, Ghana, on Monday that he would keep his promise of announcing names of his ministers this month.
Investigations showed that the screening process by the DSS involved conducting background checks on the careers of the nominees and operatives were also checking for records of the nominees with anti-graft and security agencies.
It was gathered that people on the list included mainly those who worked with Buhari when he was in the military and during his stint as the chairman of the defunct Petroleum Trust Fund.
The DSS could not be reached for comment on Wednesday as it had yet to appoint a spokesperson.