Darkwah, who recently switched camp to Kotoko, was registered by the club as late entrant, since the deadline for player registration was over.
The Ghanaian club would have to pay some fines as stipulated in the regulations by the Confederation of Africa Football (CAF) for the competition.
An official of Kotoko told the GNA Sports that, they were yet to be informed by CAF over the amount involved for the late registration.
The source said, the nature of the fine would be determined by the number of days after the expiration of the registration exercise.
Kotoko is seeking to present a formidable squad for the competition in a bid to redeem their image in the continental competitions.
Kotoko would open their competition with Congolese champions Kotoko will face 9-time Congolese champions Athletique Renaissance Aiglon (CARA) in the CAF Confederation Cup competition at the Kumasi Sports Stadium on Sunday, February 11, 2018.