The Spanish-Moroccan striker participated in Esteghlal’s training on Thursday.
He joined the Blues as a free agent, having left Leganés in Spain.
El Haddadi has joined Esteghlal to strengthen the team at the 2025-26 Iran Professional League (IPL) and 2025-26 AFC Champions League Two.
Esteghlal will play Esteghlal Khuzestan in IPL on Friday.