Kyari who had recently returned from Germany through Egypt, did not show symptoms of COVID-19.
The Chief of Staff was said to have isolated himself upon return from the trip on suspicion that he may have been exposed to the virus.
Egypt has 327 confirmed cases of Coronavirus and 14 deaths while Germany has 29,056 infections and 123 deaths.
Kyari upon his return was said to have been attending meetings including with Buhari, Vice President, Yemi Osinbajo, ministers and other members of the Federal Executive Council.
It was gathered that the FEC meeting had to be postponed after he started coughing severely and exhibiting symptoms of the virus.
Executive Chairman of Nigerian Electricity Regulatory Commission, Prof James Momoh, was said to have accompanied Kyari on the trip to both Germany and Egypt.
Kyari is currently in isolation receiving medical attention for the virus.
Meanwhile, President Buhari was said to have however tested negative for the virus