The French player has undergone several eye surgeries after suffering an injury in Esteghlal’s training.
Nekounam has said he will be out of action until the end of the season.
The 28-year-old striker joined Esteghlal in October 2021 and helped the team win the Iran league in the 2021-22 season.
Yamga’s absence will be a big blow to Esteghlal.