Ali Ahamada came off the bench for the first time in the group game when Salim Ben Boina was injured.
Ali Ahamada, the goalkeeper for the Comoros, has tested negative for Covid-19 and could start the Africa Cup of Nations last-16 tie on Monday.
The 30-year-old faces more tests to see if he is fit to play.
The Indian Ocean islanders were going to face the tournament hosts without a keeper.
Ahamada and Moyadh Ousseini both tested positive for coronaviruses after they were injured in the final group match.
If Yacine Bourhane and Ahamada meet requirements, they will be rejoining the squad.
"They are undergoing various tests, especially physical ones, to return to the competition," El Hadad Himini said in a statement.
We will wait for the findings of the medical commission to see if they can play or not.
We hope they will grant us the same rights as the other teams. We hope everything will be better for us now that we are waiting.
The game between Comoros, ranked 132nd in the world, and Cameroon will be shown live in the UK on the Red Button, as well as on the BBC Sport website.
The Indomitable Lions are five-time Nations Cup winners and the Coelacanthes were hit by a coronaviruses outbreak before their meeting.
The coach is set to be missing from the dugout after he tested positive.
Even if no recognised goalkeeper is available, sides must play if they have 11 fit players.
The first time that Comoros have ever played in the Nations Cup, they reached the knockout stages after beating Ghana and finishing third in Group C.
The Black Stars defeated Ahamada and Bourhane.
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