Detroit running back Jahvid Best has been ruled out for Sunday's game against Atlanta because of a concussion.
The Lions also put running back Jerome Harrison on the reserve/non-football illness list after he was reportedly diagnosed with a brain tumor.
Coach Jim Schwartz said Friday that Harrison was in ''very good spirits,'' but any details on his condition would have to come from the player. Citing NFL sources it did not identify, ESPN reported this week that Harrison's tumor was revealed when he had a physical after being dealt this week by Detroit to Philadelphia in a trade that was voided by that discovery.
The Lions have also signed running back Eldra Buckley. Linebacker Justin Durant, also recovering from a concussion, says he expects to play Sunday.