Detroit drafted Brown in the sixth round in 2009 out of TCU. He started twice and played in 15 games as a rookie, running for 131 yards and catching nine passes for 84 yards and one touchdown. Brown played in six games last season.
Best was limited to six games this season because he had a second concussion this year on Oct. 16 against the San Francisco 49ers.
Copyright 2011 by The Associated Press