Right to Dream Academy on a deal until 2022.
The 18-year-old forward joins compatriots Bernard Tekpetey and Nana Ampomah at the club.
The club’s Sporting Director, Lutz Pfannenstiel, is delighted that they have snapped up a promising talent.
“Kelvin Ofori is a great talent in Ghana and we are very happy that he has chosen Fortuna,” Pfannenstiel told the club website.
“He has a great technique and his pace makes him hard to defend. We are convinced that he can develop as best as possible with us.”