He said the gathering had helped the team handlers to access the fitness of the players.
Rohr spoke in an interview with newsmen on Wednesday shortly after the team rounded off its four-day training camp at the Stephen Keshi Stadium.
Nigeria will on Saturday take on Bafana Bafana of South Africa in Johannesburg in an AFCON 2019 qualifying match.
Rohr assured that there was no injury in the team at the moment, adding that all the players in camp were fit and ready for the match.
“We have done our homework; we will go into the game with high spirit and victory on our mind. I can tell you that we have no injury problem at the moment; all the players are fit and are in high spirit.
“The camping here in Asaba has helped us a lot to look at the boys in camp, access their fitness and see how each of them is doing,” Rohr said.