The 19-year-old penned a six-month contract with the Veikkausliiga side in a deal brokered by ArthurLegacy Sport.
There is an option to extend his stay if he produces consistent performances.
Ofori impressed the technical handlers of Seinajoki after a trial session.
He is a creative forward with pace and skills.
Ofori will be joining the second team to ease his way to the first team.
The Drobo-born had previously attracted interest from Italian club Cremonese.
