President Muhammadu Buhari returned to Nigeria on Sunday after a 10-day private visit to Britain, his office said, with the trip sparking fresh debate about his state of health.
The 76-year-old leader, who has previously been in London for long spells of medical care, did not say whether his latest visit was linked to health problems.
"President Muhammadu Buhari Sunday returned to Abuja after a 10-day private visit to the United Kingdom", having left Nigeria on April 25, his spokesman, Femi Adesina said in a statement.
From May 2016 until mid-2017, the Nigerian leader was in London for medical treatment for increasingly long periods of time, forcing government denials that he was gravely ill or even dead.
To date, he has not disclosed details about his condition, apart from saying he had "never been so ill" and had to undergo multiple blood transfusions.
His health status was an issue in the campaign for the February 23 presidential elections, with the opposition insisting he was physically unfit to govern.
The retired general, who was first elected in 2015, is scheduled to be sworn in for a second four-year term on May 29.
His victory is being contested in court by the main opposition leader Atiku Abubakar of the Peoples Democratic Party.