An MRI performed in the Iranian capital of Tehran on Wednesday showed that the ligament in Ravankhah's leg is damaged.
Ravankhah ruptured his ligament in the early minutes of a match against Abumoslem on Tuesday.
Esteqlal officials have decided to send the 20-year-old playmaker to a clinic belonging to FC Bayern Munich in Germany to undergo surgery.
Esteqlal, coached by Amir Qalenoei, defeated Abumoslem 2-0 in the first week of the 8th Iranian Premier League matches to position themselves at the top of the league.
The 8th Iranian Premier League kicked off on Monday.
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