He was in Britain for treatment from January to March this year, and then left Nigeria again
for Britain on May 7, where he's been since.
Last month, his aides released a photo of Buhari having lunch
in London with senior member of his ruling party, All Progressives Congress (APC), amid intense speculation in Nigeria about the President's health. Many false reports of his death have emerged online.
The latest statement described Buhari as "amused" by the conjecture around his health, adding that the President followed events at home closely and praised Nigerian media for keeping him informed.
Nigeria's Vice President Yemi Osinbajo has been the acting president since Buhari left the country.