The 30-year-old forward left Tractor Sazi in late November due to the personal issues.
Anthony Stokes, who has played for Republic of Ireland from 2007 to 2014, scored 10 goals in 11 matches for the Tabriz-based football team.
“I am very happy for returning to Tractor Sazi once again. I want to come back to Tractor Sazi better than ever,” Stokes said in an interview with the club’s website.
Tractor Sazi Scottish striker Lee Harry Erwin had already announced he would not return to Tabriz due to feelings of homesickness.