Fifa and Confederation of Africa Football (CAF) have launched an investigation into the behavior of the Copper Bullets fans during Nigeria's 1-0 win over Zambia on Saturday evening.
Photographs show the Zambia fans displaying a banner,'H.E. E.C. LUNGU GOD BLESS YOU' in the stands at the Godswill Akpabio International Stadium, in support of 'unpopular' Zambian president Edgar Chagwa Lungu.
FIFA does not allow political messages during games, which means that Zambia could be fined by football's governing body as a result at the end of the inquiry.
''However, keeping in mind that the rules need to be applied in a neutral and fair manner across FIFA’s 211 member associations, the display, among others, of any political or religious symbol is strictly prohibited.
''In the stadium and on the pitch, there is only room for sport, nothing else,'' chairman of the FIFA Disciplinary Committee, Claudio Sulser was quoted as saying by Zambian Observer.
It is claimed that the Football Association of Zambia (FAZ) were not aware of the behavior of the Zambian fans in Nigeria.