Marshall has refrained from practicing throughout the week, with the exception of a 'light jog' during walk-throughs on Friday, the Chicago Tribune's Dan Wiederer reported. Jeffery said he felt good while practicing on Friday, but stressed that practicing and playing in a game were different environments. Receiver Josh Morgan also has been listed as doubtful for Sunday due to a groin injury.
The Bears opened the season with a 23-20 loss to the Buffalo Bills at home. Marshall, entering his ninth year in the league, recorded 8 receptions for 71 yards and a touchdown. Jeffery, a third year veteran, notched five catches for 71 yards.
Chicago travels west to face the San Francisco 49ers on Sunday night.
- Christopher Woody