It appears that the Bears will be shorthanded on both sides of the ball Sunday when they visit the Tampa Bay Buccaneers at Raymond James Stadium.
Jeffery has been limited to nine games this season due to injuries to his hamstring, calf, groin and shoulder. The four-year veteran leads the Bears with 54 receptions for 807 yards and four touchdowns.
McClellin experienced concussion symptoms after last Sunday's loss to the Vikings and entered the NFL's concussion protocol. He ranks second on the Bears with 96 tackles and also has recorded two tackles-for-loss, one forced fumble and one fumble recovery.
Five Bears players are questionable for Sunday's game, meaning that they have a 50 percent chance of playing: Safety Adrian Amos (shoulder), nickel back Bryce Callahan (quad), outside linebacker Pernell McPhee (knee), cornerback Tracy Porter (ankle) and receiver Eddie Royal (knee).
For the Buccaneers, receiver Vincent Jackson (knee) and defensive tackle Akeem Spence (ankle) have been ruled out; and defensive end Kortnei Brown (groin) and safety Chris Conte (knee) are doubtful.