Mubarak Wakaso's penalty was enough to give Ghana a 1-0 victory over Mali in Group B in the Africa Cup of Nations in Port Elizabeth.
Wakaso scored from the spot in the first half after Emmanuel Agyemang Badu had been brought down in the area at the Nelson Mandela Bay Stadium.
However, the midfielder could find himself in trouble with FIFA after celebrating by pulling his shirt over his head to reveal a T-shirt with the words "Allah is Great!"
Wakaso was shown a yellow card for his celebration, ruling him out of Ghana's final group game, and could face further sanctions as FIFA rules prohibit players from making religious or political statements during a game.
Niger picked up their first ever point in the competition when their Group B clash with DR Congo finished goalless.
Gernot Rohr's side lost all three games on their tournament debut last season and went down to Mali in their opener this year, but they more than held their own against DR Congo, who were clear favourites coming into the match.
They could have taken all three points but they failed to take advantage of a three on two situation in injury time.
The result leaves DR Congo third and Niger fourth, with qualification now down to the final matches against Mali and Ghana respectively on Monday.