Nigerian president extends his medical leave in the UK as rumours swirl over his health.

The President Buhari of Nigeria is allegedly seriously ill and may remain in a hospital in London for 4 months according to reports.

Aljazeera reports, that "Nigerian President Muhammadu Buhari has asked parliament to extend his medical leave, deepening suspicions that his health is far worse than officials are publicly admitting.

The 74-year-old, who had been dogged by speculation about whether he was physically fit for office even before he took power in May 2015, had been due to return to Abuja on Sunday after taking more than two weeks' leave for medical checks in the UK.

"President Muhammadu Buhari has written to the National Assembly today, February 5, 2017, informing of his desire to extend his leave in order to complete and receive the results of a series of tests recommended by his doctors," his office said in a statement."