@Rudra Even staying with a Nigerian passport will make it hard for Chukwuma to play in England. Nigeria are over 75 in the rankings but he still needs to play in a certain percentage of Nigeria's national games (senior level) and I don't think 0% is going to help.
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He was brought into the game in 85th min recently -
http://www.sport.cz/fotbal/pohar/clanek/663864-plzen-drzela-vedeni-jen-par-minut-poharovy-duel-vyhraly-teplice.html
He still has time definitely but we all know the quality of Nigerians abroad. He plays in Czech League which isnt the best