A group of prominent Nigerians has called on President Muhammadu Buhari, 74, to take medical leave, amid growing concern about his health.

There was an “apparent deterioration” in his health following his failure to attend the last two cabinet meetings, the group said.

Mr Buhari took about seven weeks of medical leave in January, and flew to the UK for treatment.

When he returned home in March, he said he had never been so ill in his life.

Mr Buhari has not disclosed his illness, but hinted that he had had a blood transfusion.