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A brief overview of three storylines that could help determine the outcome of the Sunday night showdown between the Green Bay Packers and the Pittsburgh Steelers.

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GREEN BAY – Just in time to face Pittsburgh Steelers quarterback Ben Roethlisberger, the Green Bay Packers' secondary got reinforcements Wednesday.

Safety Morgan Burnett (groin) and rookie cornerback Kevin King (shoulder) practiced during the team’s non-padded session. Five players did not practice: outside linebacker Clay Matthews (groin), defensive tackle Kenny Clark (ankle), guard Lucas Patrick (hand), and running backs Aaron Jones (torn MCL) and Ty Montgomery (ribs).

Burnett has played only once since the Packers' early-October trip to Dallas. He returned from a quad injury that forced him to miss two games when the Packers hosted the Detroit Lions, but left that game with a groin injury. Burnett was inactive against the Chicago Bears and Baltimore Ravens.

King missed last week’s game with a shoulder injury. The Packers are hoping last week’s rest was enough to ease the pain in King’s shoulder.

“It's definitely impacted his play and his preparation,” coach Mike McCarthy said Wednesday. “It's something he's been dealing with all year. He's fighting through it. I know he wants to give it a go today.

“It's a constant that he's dealt with since really probably training camp.”