He disclosed this in a tweet on his Twitter handle @MBuhari in the late hours of Monday.

”As I noted earlier, I have absolute confidence that government will continue to run smoothly while I’m away. God bless the Federal Republic,” Buhari said.

Femi Adesina, a special adviser on media and publicity to Buhari, said the president’s trip is a follow-up medical consultation with his doctors.

Adesina added that the president was supposed to travel on Sunday, May 7 afternoon but could not because of the release of 82 Chibok girls who arrived Abuja that same day.

He said the president had transmitted the vacation letter to the National Assembly in accordance with Section 145 of the constitution,

”The president wishes to assure all Nigerians that there is no cause for worry. He is very grateful for the prayers and good wishes of the people, and hopes they would continue to pray for the peace and unity of the nation.

”The length of the president’s stay in London will be determined by the doctors. Government will continue to function normally under the able leadership of the vice-president.

”President Buhari has transmitted letters about the trip to the Senate and the House of Representatives, in compliance with Section 145 (1) of the 1999 Constitution,” the statement added.

ThisDay reports that the senior special assistant, legislative matters (House of Representatives) Abdulrahman Kawu Sumaila however said Buhari is fit to seek re-election in 2019 elections.

According to him: “From what I have seen at close range, my boss is quite fit for the 2019 electoral battle.’

”President Buhari’s fitness was played upon in 2015 general election. He survived the campaign rigour, won the election and is on the verge of taking Nigeria to the promised land.

”Buhari is quite alright, he is fit to pass through a familiar terrain, and its human to fall sick. I am highly confident he would get better.”

‘He added: ‘Those who have legitimate ambitions should step forward, but they should also have at the back of their minds the fatal consequences of such misadventure in 2015.

”He also said that the president’s two years in office had been “eventful and fruitful.

”His ability to degrade the insurgency was a landmark in the history of this country.”

Sumaila also urged Nigerians to continue support the government so that it can accomplish the dividends of democracy.

He left the country on Sunday, May 7 after he met with the vice president Professor Yemi Osinbajo, Senate president Bukola Saraki and Speaker Yakubu Dogara.