Baltimore rookie Sergio Kindle fractured his skull shortly before training camp in July when he fell down two flights of stairs. The former Texas standout underwent a series of neurological exams from independent doctors in Baltimore. "He's got some serious issues that he's dealing with," Ravens coach John Harbaugh said Friday after practice. "The chances of him playing this year are slim. We're going to be very, very careful. The doctors are going to very careful. Sergio is going to be very careful with that type of an injury."