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Al-Ittihad was the final club that Karim El Ahmadi played for before retiring. He joined the Saudi Arabian club in 2018 and remained there until he announced his retirement in 2021. During his time with Al-Ittihad, El Ahmadi made significant contributions, helping the team win the Saudi Super Cup in 2018 and the King's Cup in 2019. He also captained the team during his tenure.