TEHRAN Persepolis football club completed the signing of Mohammadmehdi Ahmadi on Sunday.The 21-year-old left winger has joined Persepolis from Naft Masjed Soleyman.Ahmadi has penned a three-year contract with Persepolis.Persepolis have previously completed the signing of Alireza Beiranvand (goalkeeper), Morteza Pouraliganji (defender) and Danial Esmaeilifar (right winger).