The Syli Nationale’s chances of making it out of Group B was dented by Kenneth Omeruo’s header in the 73rd minute as the Super Eagles ran out winners in Alexandria.
The defeat leaves Guinea with just a point after two games in Egypt, but Keita has issued a rallying call to his teammates to remain confident ahead of their next match.
“It wasn’t our day today but we did all we can and played to our level best,” Keita told the press after the game.
“We have to keep our heads high and move to the next match with an aim to win. It is not yet over and we will fight till the end.”
Keita was in action for 70 minutes and looked to be close to his best, before he was later replaced by Lass Bangoura.
Guinea will face Burundi in the last Group B fixture at the Al-Salam Stadium on Sunday.