The Ethiopian Football Association has said it will investigate Nigeria's claim fans attacked their team bus after the countries' World Cup play-off in Addis Ababa on Sunday.
Nigeria said midfielder Nosa Igiebor (pictured) was injured when the bus windows were shattered as the team left the stadium after their 2-1 win - and they have reported the incident to Fifa.
Newly-elected Ethiopian FA president Juniedin Basha said: "We saw the reports that Nigeria's bus was attacked and a player was injured.
"Tuesday was a holiday in Ethiopia so we couldn't do anything about it, but we will work with the security forces to investigate what has actually happened and hopefully respond soon."
The two teams will meet in Calabar for the second leg of the play-off on 16 November.