The latest Cabinet changes also saw Major (Rtd) Alfred Palo Conteh appointed the new Defence minister.
Major Conteh previously served as Internal Affairs minister. The Defence portfolio had been vacant since the beginning of President Koroma’s second term after the 2012 polls.
President Koroma also made changes in the ministries of Information, Finance and Social Welfare.
Former presidential adviser Alpha Kanu was appointed Information minister, replacing Mohamed Bangura – the man who succeeded him in the same office in 2013.
Mr Bangura was one of two presidential advisers named on Monday. Others include two other former APC presidential flagbearer contestants.
The changes on Monday came less than a week after a major shakeup in the top security echelon, hence the questions about the president's motive.
While some say the rehiring of former ministers made no sense, with less than four months to the end of President Koroma's mandate, others say it was a strategic move of calming tension sparked by his decision to hand-pick the party's presidential candidate.