Oumarou debuted internationally for the
Niger national team on 13 November 2015 in a friendly match against
Nigeria in a 2–0 loss. On 16 October 2018, he scored his first goal for Niger against
Tunisia in a 2–1 defeat during the
2019 Africa Cup of Nations qualification to be held in
Cameroon. On 8 October 2021, during the
2022 FIFA World Cup qualifying match against
Algeria, he scored an own goal which resulted in a 6–1 defeat. ==References==