GREEN BAY, Wis. -- For the better part of two decades now, the Green Bay Packers backup quarterback has been little more than an afterthought.
With Aaron Rodgers knocked out of the game -- and perhaps longer -- by a shoulder injury on the first series, Josh McCown and the Chicago Bears reminded the Packers why good insurance is so important. McCown, playing in place of the injured Jay Cutler, threw for two touchdowns Monday night and led Chicago to a 27-20 victory that ended a six-game skid to its NFC North rivals.
"We expected to win this game, even with the situation that happened," Jordy Nelson said. "We had an opportunity to win the game, and we just didn't make enough plays."
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 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."
Pressed for more information, McCarthy insisted there wasn't any.
"No timeline, no exact diagnosis," he said. "That's where we're at."
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 TD, and also had 54 yards receiving for the Bears, who pulled into a three-way tie for first in the NFC North with Green Bay and Detroit.
All are 5-3.
"It'd be hard to find one better than this," said McCown, who was coaching high school when the Bears signed him two years ago. "They're all special, but this is really neat because it means so much to our team."
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 there are injuries and then there are INJURIES, and a hurt 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 the most anonymous person in Green Bay.
"Aaron's a huge part of our offense," McCarthy said. "This is a thing that's been built over time with Aaron as the centerpiece. I don't think it's realistic to put anyone in there and think they're going to pick up and run it the way he has run it."
But as the Bears know all too well, backups can be just as invaluable as a starter.
After a series of forgettable backups under Lovie Smith -- Caleb Hanie or Jonathan Quinn, anyone? -- the Bears signed McCown when Cutler was hurt two years ago. He played well enough then to stick around, and his familiarity with his receivers and coach Marc Trestman's system was evident.
McCown may not have been dazzling, going 22 for 41 for 272 yards, but he mixed his passes effectively to Marshall, Jeffery and Forte, and Forte ran roughshod on the Green Bay defense.
The Bears sealed their victory with 53 seconds left with Robbie Gould's 27-yard field goal, which followed an 18-play, 80-yard drive that ate almost nine minutes off the clock.
"You understand the nature of the game and the impact that [Rodgers] has on the game," McCown said. "So when that player's not on the field, your odds of winning probably increase."
Better yet, McCown didn't do anything to hurt the Bears, which is more than Wallace can say.
Wallace hadn't played a game since the 2011 season finale, and the rust was evident. He was intercepted on his very first series by Julius Peppers and was sacked twice, once by Peppers and once by McClellin. The Packers had a second-and-goal from the Bears 5 late in the third quarter and were forced to settle for Mason Crosby's 23-yard field goal after Wallace overthrew James Jones and Andrew Quarless. Green Bay would get no further than the Bears 39 the rest of the game.
Wallace finished 11 of 19 for 114 yards. The Packers were just 1 of 9 on third down.
"Seneca, he needs to perform better, and he'll definitely do that with a week of practice," McCarthy said.
This was Green Bay's first loss to an NFC North foe at Lambeau Field since Nov. 1, 2009, when Favre returned with the Minnesota Vikings. ... It was Chicago's first victory in Green Bay since 2007. ... Green Bay's 199 yards rushing was a season high, and best since the Packers ran for 202 against Cleveland on Oct. 25, 2009. ... Jamari Lattimore blocked a punt and recovered an on onside kick for the Packers.