Mlive.com: Lions WR Calvin Johnson (concussion) was held out of
Wednesday's practice but is expected to play Sunday. Safety Gerald
Alexander, who went on the injured reserve list with a neck
injury, is expected to have surgery, but his condition is not
believed to be career-threatening. Defensive tackle Chuck Darby
(calf strain) did not participate in Wednesday's workout but has
not been ruled out against Houston.
Fantasy Impact: