Celio Ferreira dos Santos or simply Celio was a member of Tractor Sazi in 2015 but left the team to join Emirati football club Al-Shaab CSC.
The details of Celio’s contract have not been disclosed.
The 31-year-old center back has most recently played at Indonesian club Persija Jakarta.
Tractor Sazi will start Iran professional League new season under coaching of well-known Turkish coach Mustafa Denizli.