After his 2011 season was cut short because of a concussion, the Lions have doubts as to whether Jahvid Best will be able to play again. Best missed most of the season following an Oct. 16 loss to the 49ers and was bothered by post-concussion problems the rest of the season. He also suffered a concussion during the preseason and had a scary head injury while at the University of California, Berkeley, but Best told the Detroit Free Press earlier this month that he's symptom free and "definitely" will be back next season. However, multiple people within the organization are concerned the second-year running back might not play football again, according to MLive.com.