ALLEN PARK, Mich. -- Detroit Lions running back Jahvid Best has been put on the active physically unable to perform list.
Instant Debate: Breakout stars
Who'll be the breakthrough studs of training camp? Our analysts reveal their picks, including Chargers WR Vincent Brown. **More ...**
Best didn't play last season after a concussion suffered in a game against the San Francisco 49ers on Oct. 16. He also had concussion problems last preseason and when he was a college player at California.
Best started nine games for the Lions as a rookie in 2010 and rushed for 390 yards on 84 carries last season. Without him, Detroit needed to piece together some semblance of a running game to complement quarterback Matthew Stafford and star receiver Calvin Johnson.
The Lions started practice Friday. They were forced inside by a rainstorm.
Detroit has also put offensive lineman Jonathan Scott on the active non-football injury list.
Copyright 2012 by The Associated Press