President Muhammadu Buhari has asked Vice-President Yemi Osinbajo to continue in acting capacity while he keeps resting.
Though Buhari's return may provide some semblance of closure, lingering questions about his capabilities and the state of Nigeria's economy, have left a lasting cloud of uncertainty in the air.
But he said he was "pleased to be back", although he disclosed that he may need "further follow-up within some weeks".
"That makes his return to work formal and constitutional", his spokesman Femi Adesina said. Hethe President said he felt much better, saying that "whatever the case I'm still grateful to Nigerians".
At the meeting, he did not give any indication of what illness he was suffering from but said "I have received, I think, the best of treatment I could receive". He was originally due to return to Nigeria February 6 after having treatment in Britain, but wrote to the National Assembly to request an extension while he waited for medical test results and rested on doctors' advice.
The wife of the president, Aisha Buhari welcoming President Muhammadu Buhari.
Leicester continue good form with dramatic win at West Ham
Towering centre back Robert Huth doubled the lead for the away side he headed in a 7th minute corner by Marc Albrighton. City striker Jamie Vardy had scored just a hat-trick against Manchester City in his previous 26 games before today.
Little information has been made public about his latest stay in the United Kingdom capital, but he was pictured on Thursday meeting the most senior cleric of the world Anglican congregation, Archbishop of Canterbury Justin Welby.
Government officials have been cagey about the nature of Buhari's illness.
"Nothing much will change in terms of governance; the vice president is still very much likely to be going around more frequently than Buhari", policy expert Olusegun Sotola told Bloomberg. President Buhari joins family members.
Buhari had previously travelled to London in June a year ago to receive treatment for what was described as a persistent inner ear infection.
"President Buhari is not the person that is sick; so, we pray to God to guide and keep him".
Yar'Adua's initial illness and treatment in hospital overseas triggered months of political uncertainty.