Córdoba was stretchered off the pitch and replaced by Nicolas Burdisso. It immediately became clear that the injury was nothing trivial.The Colombian underwent medical tests today at the San Matteo Orthopaedics Clinic in Pavia, and he has been diagnosed with a damaged cruciate ligament in his left knee.Córdoba will be required to undergo arthroscopic surgery to repair the damage, thus putting the rest of his season in huge doubt.