Lena Oberdorf’s knee injury has overshadowed Germany’s convincing 4-0 victory over Austria in their final match before next week’s start of the Paris Olympics tournament. Key midfielder Oberdorf got stuck in the turf 70 minutes into Tuesday’s match and had to be substituted. She was in big pain and examinations later on Wednesday are to determine the exact nature of the right knee injury. The German team is set to fly to Marseille on Sunday, with the first match four days later there against Australia. The 2016 gold medallists also face record winners United States and Zambia in the group stag…