The comments followed earlier reports that players were demanding unpaid bonuses and that a training session on Thursday night had been canceled because of the dispute.
However, media officer Ben Alaiya told reporters: "It is settled now. It's absolutely settled now. Let's not dwell on the past. There is no problem now, that is why everyone is training."
Alaiya said Thursday's training had been canceled because a team meeting near its base in Campinas, north of Sao Paulo, had overrun, leaving no time for the session.
The African champions flew to the capital Brasilia yesterday ahead of the knockout game against the French on Monday.
Nigeria is not the only African team to have had problems with player payments.
Fellow West African teams Cameroon and Ghana have both had their World Cup campaigns badly distracted by pay disputes.
Cameroon's squad refused to get on a plane to Brazil at the beginning of the month until their bonuses were improved and Ghana said it flew in cash from back home to keep its players happy ahead of the decisive final group game against Portugal.
