President Muhammadu Buhari has tested negative for coronavirus.
However, his Chief of Staff Abba Kyari tested positive, making the number of cases 41 in the country.
The Federal Government on had said Monday that Nigeria had 40 coronavirus cases and one death caused by the disease.
The Minister of Health, Dr Osagie Ehanire, had earlier at a press conference in Abuja on Monday said the country had 36.
But at 11pm on Monday, the Nigeria Centre for Disease Control on its twitter handle said the cases had increased to 40.
The NCDC announced the new cases just as the Federal Government ordered complete closure of land borders to human traffic and postponed the Federal Executive Council and the Council of State meetings indefinitely.
The Federal Government also advised Lagos and Abuja residents to stay at home to prevent the spread of the disease.
Giving an update on COVID-19 cases, Ehinare said the Federal Government would publish names of people who refused to go into self-isolation after returning to Nigeria from countries with high burden of coronavirus.
He said Nigeria could be heading the way of China and Italy, which had recorded high number of coronavirus cases and deaths. The health minister said some people who had been infected were hiding.