GREEN BAY, Wis. -

Green Bay Packers running back Eddie Lacy reportedly is seeking a second opinion on his sore ankle and is expected to miss at least the Packers' game Thursday.

Lacy sat out practice Tuesday and is set to see foot specialist Dr. Robert Anderson this week, according to ESPN's Adam Schefter and NFL Media's Ian Rapoport. The latter also reported that Lacy is expected to miss a few weeks.

Green Bay (3-2) will host the NFC North-rival Chicago Bears (1-5) on Thursday.

The 26-year-old bruising back took to the air on two occasions in a bid to hurdle defenders in Sunday's loss to the Dallas Cowboys. Lacy played 31 snaps and rushed 17 times for 65 yards for the Packers, who are also without James Starks after the backup running back underwent knee surgery on Sunday.

The Packers carried only two running backs on their roster, but McCarthy used wide receivers Ty Montgomery and Randall Cobb in the backfield.

To address the depth problem, the Packers traded for Kansas City Chiefs backup running back Knile Davis earlier Tuesday.

Davis, 25, has only one carry this season, with Spencer Ware emerging as the top sub for Jamaal Charles. A third-round pick in 2013, Davis has averaged 3.3 yards per carry with 11 touchdowns on 223 career attempts.

"Until we get going, the goal is to get him ready for practice today, and then we'll take it from there," McCarthy said of Davis. "It's part of the NFL landscape, and it's obviously a big challenge when you're on a short week. But he's definitely a talented young player."

The Packers placed cornerback Sam Shields (concussion) on injured reserve to make room for Davis. Shields has missed the team's last four contests.