According to ATLUTD, a timetable for Sosa's return will be "assessed in a few weeks" as he rehabs this offseason.
Sosa, a former Argentina youth international, joined Atlanta ahead of the 2021 season from River Plate.
The 22-year-old became a key cog for the Five Stripes, starting all 25 of his appearances as they earned the East's No. 5 seed. The deep-lying midfielder, renowned for his passing range, projects as an important piece for manager Gonzalo Pineda's 2022 plans.