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According to the Gabonese Press Agency, AGP, Mouyouma will include 25 players in the list.
The Panthers will take on the Super Eagles of Nigeria in the semi-final at the El Barid Stadium, Rabat, on Thursday, November 13.
The winner will face either Cameroon or Democratic Republic of Congo in the final.
Captain Pierre-Emerick Aubameyang, Mario Lemina, Dennis Bounaga and other regulars are expected to be included in the squad.
Gabon will open camp for the playoffs in Rabat on Sunday.
