Shortly before the vote, Soyinka had vowed to give up his permanent US residency over a Trump victory to protest against the Republican billionaire's campaign promises to get tough on immigration.
"I have already done it, I have disengaged (from the United States). I have done what I said I would do," the 82-year-old told AFP on the sidelines of an education conference at the University of Johannesburg.
The prolific playwright, novelist and poet won the Nobel Prize for Literature in 1986 and has been a regular teacher at US universities including Harvard, Cornell and Yale.
At the same time he said he would not discourage others from applying for a green card.
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"It's useful in many ways. I wouldn't for one single moment discourage any Nigerians or anybody from acquiring a green card... But I have had enough of it," he said.
He was reported to have recently completed a term as scholar-in-residence at New York University's Institute of African American Affairs.