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Green Bay, Wis. • The Chicago Bears have a better insurance policy than Aaron Rodgers and the Green Bay Packers.

Josh McCown, playing in place of the injured Jay Cutler, threw for two touchdowns Monday night as the Bears won 27-20 and ended a six-game skid to their NFC North rivals. The loss snapped Green Bay's four-game winning streak, but the far larger concern is the health of Rodgers, who hurt his left (non-throwing) shoulder when he was sacked on the first series by Shea McClellin.

Rodgers took a few warm-up throws with backup Seneca Wallace but, after being examined by medical staff, ran into the Green Bay locker room. He wasn't seen again until midway through the third quarter, when he came back onto the field in sweats. Though he waved to fans with his right hand, and didn't appear to be wearing a brace, he kept his left hand jammed in his sweatshirt pocket.

"He has a shoulder injury," Packers coach Mike McCarthy said. "They want to run more tests. They don't have an exact diagnosis. We'll have more information, probably tomorrow."

Alshon Jeffery had five catches for 60 yards, including a 6-yard grab for the go-ahead touchdown at the end of the third quarter. Brandon Marshall, largely shut down in two games against Green Bay last year, had seven catches for 107 yards and a score. Matt Forte ran for 125 yards and a score, and also had 54 yards receiving.

The win pulls the Bears into a three-way tie for first in the NFC North with Green Bay and Detroit, all at 5-3. The loss spoiled another big night by Green Bay rookie Eddie Lacy, who ran for 150 yards and a touchdown.

Green Bay has been hit hard by injuries, with James Jones (knee) returning Monday night after a two-game absence and sackmaster Clay Matthews (thumb) and tight end Jermichael Finley still out. Wide receiver Randall Cobb (leg) is also on the injured list-designated to return, and offensive lineman T.J. Lang (concussion) and linebacker Andy Mulumba (ankle) left the game.

But an injured Aaron Rodgers is Green Bay's ultimate nightmare.

With the 2011 NFL MVP almost as durable as predecessor Brett Favre — he hasn't missed a game due to injury since Dec. 19, 2010 — the backup quarterback has been little more than an afterthought in Green Bay.

"Aaron's a huge part of our offense," McCarthy said.