The highly-rated teen will from now be clothed by the US-based company.
Issahaku disclosed the deal on social media amid reports of a move to German Bundesliga powerhouses Bayer Leverkusen.
He however did not reveal the number of years he signed the dotted line.
Issahaku is on the books of Ghanaian second-tier side Steadfast FC.
The 17-year-old has enjoyed an incredible year, having captained of Ghana's U17 side to clinch the WAFU B U17 Cup of Nations in January.
He earned his first call-up for a 2020 Africa Cup of Nations qualifying matches against South Africa and Sao Tome and Principe in March.
Issahaku has also been named in a 30-man squad for Ghana's upcoming friendly fixtures against Morocco and Cote d'Ivoire next month, where he will look to make his debut for the side.
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