Chris McCosky/ The Detroit News
Allen Park — Jahvid Best (concussion), as expected, was not cleared for practice Tuesday, amid reports that he will miss his third straight game Sunday.
ESPN, citing an anonymous league source, reported that Best would not play at Chicago. The team has not officially ruled him out.
Running back Kevin Smith, waived by the Lions after last season, was signed Monday and was working in as the No. 3 running back early in practice Tuesday.
Veteran guard Leonard Davis, signed Sunday, was working at No. 2 right guard Tuesday.
Defensive tackle Sammie Hill (foot) was the only other player not practicing. Rookie tackle Nick Fairley (foot) was practicing, though he still looked limited in the early drills.
Receiver and special teams ace Rashied Davis, who has missed six games with a foot injury, was back and looked to be at full strength. He worked as one of the gunners on the first punt coverage unit.
The Lions also made a practice squad move, signing former LSU receiver Terrence Tolliver and releasing offensive tackle Casey Bender.