OfoIgbo:


He has renounced Nigeria online.
Secondly, he does not have a valid Nigerian passport to reinforce his Nigerianness.
But he does have a valid UK passport, and i am sure that in his recent correspondence with the UK authorities, since he was abducted, he must have made it clear he is British and seeks their assistance. You don't get any more official than that.

Otherwise prove to us he is still Nigerian, e.g a valid Nigerian passport owned by Kanu

He has a Nigerian State of Origin..