Volker Finke lamented Cameroon's lack of concentration as their FIFA World Cup campaign ended in a 4-1 defeat to hosts Brazil.
The fate of the African nation had already been sealed before Monday's Group A fixture in Brasilia, following defeats to Mexico and Croatia - the latter blighted by Cameroon's ill-discipline.
Cameroon showed glimpses of the talent that got them to the World Cup in the first place against Brazil, and even threatened an upset when Joel Matip cancelled out Neymar's opener.
However, Neymar restored Brazil's lead before half-time, while second-half goals from Fred and Fernandinho set up a last 16 clash with Chile for the tournament hosts.
Finke congratulated Brazil on the victory and believes his team must become more street wise to improve.
"There were times we played well but we need to work on our concentration," he said.
"We lost the ball three times and conceded three goals from it. We don't seem to be able to concentrate for 90 minutes and we'll have to work on that.
"Brazil deserved to win tonight, they created more chances."