The 18-year-old has been farmed out by Segunda Liga side Vizela FC.
Safo will feature for the Porto II side in the second-tier league.
He teams up with countryman Kelvin Owusu Boateng who has scored three goals in six matches.
Safo graduated from the Rising Stars of Africa Academy in Ghana and moved to Portugal in February this year.
After a successful trial, he penned a contract with Vizela FC was swiftly promoted to the First Team after explosive displays with the club's U19 side. Read Full Story