Bayer Leverkusen will be without Germany midfielder Florian Wirtz for months after the 18-year-old tore the anterior cruciate ligament in his left knee on Sunday. The Bundesliga club said in a statement that an MRI examination in hospital had confirmed the diagnosis. Wirtz had to be carried off the pitch in the 28th minute of the 1-0 home derby defeat by Cologne. The midfielder had fallen to the ground after twisting during a challenge with Cologne’s Luca Kilian. In addition to Wirtz, Jeremie Frimpong and Odilon Kossounou also had to be substituted due to injury. Third-placed Leverkusen are al…