Arsenal defender Shkodran Mustafi was left red-faced after scoring a disastrous own-goal in Schalke’s 5-0 defeat away at Wolfsburg on Saturday.Mustafi, who called time on his four-and-a-half-year spell with the Gunners to join Dimitrios Grammozis’s side last month, headed past his own goalkeeper to give Wolfsburg the lead in their humiliating five-goal drubbing.As the hosts tried to venture into the box at the Volkswagen Arena, Schalke centre-back Malick Thiaw desperately tried to get a foot on the ball and ended up knocking it in the path of Mustafi.Yet instead of simply clearing his lines, the Germany star attempted to head it back to goalkeeper Frederik Ronnow.Unfortunately for Mustafi, Ronnow had already taken a few steps to his right
