The pair have penned three-year deals with the National First Division outfit.
AmaTuks have also added former Bloemfontein Celtic midfielder Shane April to their roster.
Tuks paraded their recruits in a friendly in Tshwane yesterday against Mamelodi Sundowns, who fielded their new signing Phakamani Mahlambi upfront.
"They are very good players as you saw against Sundowns," a source at Tuks says of midfielder Franco and his compatriot Luigiana.
"Both have signed three-year deals with the club."
University of Pretoria are seventh on the second-tier standings with five points from three games, and next visit fellow mid-table side Witbank Spurs on Saturday.