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Packers cornerback Sam Shields was placed on injured reserve Tuesday with a concussion, but he wrote on an Instagram post he hopes to return in eight weeks.

"I'm making great progress and hope to come back in 8 weeks and play this season," Shields wrote on his verified account. "I will make a full recovery within that time frame."

Shields hasn't played since suffering a concussion in the season opener against Jacksonville. Green Bay's top corner has had at least five documented concussions in his professional career.

The seventh-year corner missed the final three games of the regular season in 2015 due to a concussion sustained in Dec. versus the Cowboys, but returned for the club's playoff overtime loss to the Cardinals.

Shields, 28, is currently in the third year of a four-year, $39 million deal.

The Packers' secondary injuries don't stop with Shields, as corner Quinten Rollins has already been ruled inactive for Thursday's game against the Bears with a groin injury. Cornerback Demarious Randall left last Sunday's game with a groin injury.

To take Shields' roster spot, the Packers officially announced that they've acquired former Chiefs RB Knile Davis in a trade, first reported by Terez Paylor of the Kansas City Star.

Davis provides much needed backfield depth after Green Bay had just one active back, Eddie Lacy, in the Week Six loss to the Cowboys. Lacy played at less than 100 percent due to an ankle injury, but with James Starks reportedly undergoing a knee scope this weekend, he was Mike McCarthy's lone option.

Davis was relegated to special teams in Kansas City due to its impressive RB depth with ascending Spencer Ware and Charcandrick West behind Jamaal Charles. But Davis, who's scored 12 rushing/receiving touchdowns in his first four seasons, has been an impact kick returner with three additional scores, including a 106-yarder to open Kansas City's 30-0 blowout in Houston in last season's wild-card round.

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