The 31-year-old striker was a member of the Qatari side Umm Salal last season and scored three goals in 10 matches.
He started his playing career in the Portuguese team Nacional and has also played for English sides Blackburn Rovers and Reading.
Lucas Joao made his full debut for Portugal in 2015, before changing his allegiance to Angola in 2022.
Persepolis sits fifth in the 2024-25 Iran Professional League (IPL) after three weeks.