Buhari left Nigeria on Sunday, May 7, after writing a letter to the Senate on his travel plans.

The letter, which was read by Senate President, Bukola Saraki on Tuesday, May 9, states that only the president’s doctors could decide how long his trip would last.

“I wish to inform the distinguished senate that I will be away for a scheduled medical follow-up with my doctors in London. The length of my stay will be determined by the doctors’ advice,” the letter read.

“While I am away, the vice-president will coordinate the activities of the government,” it added.

The indefiniteness of Buhari’s trip had earlier been hinted at by his spokesman, Femi Adesina before the president’s departure.

“I don't recall that our laws have stated any time frame in which a President who is recovering can be away from duty post,” Adesina said while appearing on Channels TV.

Buhari, in January, wrote the Senate to announce that he would spend 10 days in London on a medical vacation.

The president however extended his vacation and ended up spending 49 days abroad.

He returned to Nigeria in March and announced that he had never been so sick in his entire life.

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Buhari also said, at the time, that he would soon return to London for follow-up treatment.