The Nigeria Football Federation (NFF) has confirmed it has launched a preliminary investigation into an allegation of bribery against coach Salisu Yusuf.
Gernot Rohr's assistant is accused of accepting money in return for a request for two players to be selected for a continental championship.
Yusuf, also the coach of Nigeria's Olympic squad, denies all wrongdoing but the NFF is examining the allegation.
"It's true that the NFF has commenced a preliminary investigation into the matter to assist the Committee on Ethics and Fairplay," NFF director of communications Ademola Olajire told BBC Sport.
"This is a very sensitive matter and a proper investigation is required by the football authority. For now, there will be no further comments on this subject."
"There is nothing in the allegation pointing to a demand for the money from the agents of the two principals," Yusuf said in a right of reply.
"Rather, the agent only handed the money to me after expressing 'hope' that the principals would play in the Championship.
"Be that as it may, I did accept cash handed to me by one of the said football agents, which I later discovered, upon checking, to be $750 and not $1,000."
