Brown was on the Lions' roster for two seasons, but was cut prior to the start of the regular season.
In 21 career games and two starts, he has a 4.3 average per carry.
Besides losing Best for the season, the Lions are also dealing with Kevin Smith ailing with a sprained ankle.
For more coverage of the NFL, go to profootball.scout.com.
Follow me on Twitter: @RavensInsider