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Former nationals of Nigeria can enter Nigeria visa-free by traveling with their new passport of their new nationality along with their expired Nigerian passport.
Timatic, the database which airlines use to verify passenger travel documents, states:
Passport required.
- Passports and other documents accepted for entry must be valid for a minimum of 6 months from the arrival date.
Visa required, except for Former nationals of Nigeria with a valid foreign passport and an expired Nigerian passport.