It will be the fourth time Buhari will seek medical treatment in the UK. His spokesman said Buhari saw his doctor last week in London on his way back from Washington where he had
met with the US President Donald Trump at the White House.
"In the course of the technical stop-over for aircraft maintenance in London on his way back from Washington last week, the President had a meeting with his doctor," his aide Garba Shehu said in a statement.
Another aide, Femi Adesina, told CNN Buhari had gone for a "medical review" and would be back within four days as stated.
"No one can guarantee what is going to happen at any moment, but what we are saying is that the President will be back on Saturday. This visit to the doctor does not mean he will be there for months.
"It is a meeting to review his health. It has nothing to do with elections and it does not mean he won't be able to contest." Adeshina said.