No issues with Bears' Marshall's back

Chicago Bears star wide receiver Brandon Marshall practiced with no restrictions on Friday after giving the team a scare during the previous day's session.

Marshall exited Thursday's workout with tightness in his back, but was back on the field Friday and listed as probable for Sunday's game at Pittsburgh.

The four-time Pro Bowl wideout has compiled 217 yards and two touchdowns on 15 receptions through Chicago's first two games, both wins. Marshall finished second in the NFL with 118 catches totaling 1,508 yards last season, his first in Chicago after being acquired in a trade with Miami.

Cornerback Charles Tillman, who is dealing with knee soreness, also returned to practice Friday, albeit on a limited basis. The Bears termed the 11-year veteran questionable to face the Steelers, though he has not missed a game since 2009.

Tight end Martellus Bennett (shoulder) and right guard Kyle Long (back) are also probable for Sunday's matchup.