The 18-year-old replaced Eldor Shomurodov in the 75th minute and drilled in his opener after 82 minutes.
Gyan struck another massive goal in added on time to end AS Roma's three-match winless run.
Henrik Mkhitaryan produced a mazy run past the Genoa defenders before splitting the ball to the right side for Gyan, with his electric speed, to drill home on the turf.
Gyan announced his presence again with an classy strike in injury time to make it 2-0 for the capital club.
He smashed in a curler from outside the box into the far top corner.
The former EurAfrica Academy player was making only his third Serie A appearance.
Read Full StoryGOAL: 90+' Genoa 0-2 AS Roma | Felix Afena Gyan again! #SerieA #GenoaRoma
— Ronald Morgan (@ronaldmorgan_) November 21, 2021
Follow for more goals @ronaldmorgan_ pic.twitter.com/zmawfMI6A4
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