According to ESPN's Adam Schefter, Jahvid Best "doesn't look like he's going to play this week, or for some time" because of concussion-related symptoms.
Source: Evan Silva on Twitter
Fantasy Advice: Not only is Best's 2011 season not going so well, but his injury history is making his dynasty value very shaky. Best has yet to take any part in practice and doesn't look like he will be cleared for awhile. The best (no pun intended) owners can hope for is that he returns sometime during fantasy-league playoffs.