The 33-year-old point guard has won two NBA championships, lifting the trophy with the Golden State Warriors and the Los Angeles Lakers.
Cook is expected to team up with Iranian basketball icon Hamed Haddadi, a move that would mark one of the most high-profile transfers in the history of Iranian sports.
Esteghlal currently sits third in the 2025–26 Iran Basketball Super League, trailing league leader Shahrdari Gorgan by two points.
The potential arrival of Cook could significantly strengthen the club’s title ambitions for the remainder of the season.