The man, identified as Okonkwoh M Tony, was apprehended a few days ago after he landed at the Indira Gandhi International Airport (IGIA) here from Ethiopia's capital Addis Ababa.
He was admitted to a hospital by the sleuths of the Delhi Zonal unit of the Narcotics Control Bureau (NCB).
Officials said he has ejected 90 cocaine-filled capsules weighing 1.3kg in two days.
They said Tony had initially misled the sleuths saying he had come to India for business purpose while carrying a tourist visa.
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The officials claimed Tony was supposed to hand over the drug capsules to another Nigerian national here, whom the agency has been trailing.
Tony has been arrested under provisions of the Narcotic Drugs and Psychotropic Substances (NDPS) Act.
This is the fourth case of seizure of cocaine by the NCB in Delhi in the last one month.