Buhari returns after lengthy UK medical treatment

President to address nation following more than three months of absence spent in London for an undisclosed ailment.

Nigerian President Muhammadu Buhari has returned to the country on Saturday after more than three months in the UK for medical treatment for an undisclosed "health challenge".

The 74-year-old left for London on May 7.

His prolonged absence caused tensions back home where calls have grown for him to either return or resign.

"President Buhari is expected to speak to Nigerians in a broadcast by 7am on Monday," his office said.

In recent weeks, the office has been releasing photos of officials meeting with the rail-thin but smiling president in the hope of reassuring people back home.