According to BBC, President Muhammadu Buhari, 74 went to the UK for treatment for an unspecified illness. On Sunday he is said to have met governors from his party for lunch and was very cheerful.
His absence has led to some anxiety in Nigeria, with some speculating that he might have died. Others have worried he may not be able to return to duty.
Reports say the president was very cheerful and has not lost any bit of his sense of humour.
President Buhari left Nigeria on 7th May - his second trip to the UK for treatment this year.