Hauwa died on Sunday evening from complications during childbirth.
News of the death was made known by the official Twitter account of Nigeria Football Federation (NFF).
“Our thoughts are with @NGSuperEagles forward @Simon27Moses who lost his elder sister Hauwa during child birth on Sunday evening,” the NFF statement reads.
No words yet from the KAA Gent of Belgium player and all efforts to reach him by Pulse Sports have been unsuccessful.
Moses Simon was part of the Super Eagles team that played in two friendly games against Mali and Luxembourg in Ma.