If the Green Bay Packers are going to survive the absence of the franchise's most important player, they're going to have to do it with the roster's least experienced player.

Before Sunday, quarterback Scott Tolzien not only had never appeared in an NFL regular-season game, he had never been in uniform for one. And as far as the Packers were concerned, if everything went well against the Philadelphia Eagles he would still be looking for his first professional snap.

But that's not the way the 2013 season has gone for the Packers, and so 9 minutes 8 seconds into the first quarter of his first game on a 53-man roster, Tolzien trotted out toward the south end zone at Lambeau Field and prepared to take over the job Aaron Rodgers has held since the 2008 season.

For the second straight week, the backup had to play.

"I've never lost a quarterback after the first series two weeks in a row," coach Mike McCarthy said after the Packers' 27-13 loss to the Eagles. "It's an unusual situation."

Tolzien played well enough against the Eagles that McCarthy declared him the starter against the New York Giants, ruling out veteran Seneca Wallace, who left after one series because of a groin pull. The previous week, Wallace came into the game after one series because Rodgers broke his left collarbone.

When he discovered that Rodgers would be out about a month, general manager Ted Thompson signed Tolzien off the practice squad Wednesday to be his backup quarterback. Tolzien spent the week preparing to play against the Eagles, but got only a couple of snaps because the priority was to get Wallace ready.

Then all of a sudden he found himself entering the game with the ball on the Packers 6-yard line and a 7-0 deficit.

"It's two weeks in a row," McCarthy said. "I mean, you have a guy that goes through the week and takes all the reps. Unfortunately, he (Wallace) suffered the injury there in the first series.

"I thought Scott did a hell of a job. We're running plays he hasn't even practiced yet. He comes here, and it's a totally different language from where he's been his first two stops. For the most part, he was seamless in the huddle."

Under center, Tolzien looked more capable than the 33-year-old Wallace, firing passes with some steam on them and standing in the pocket amidst heavy blitzing from the Eagles. He completed 24 of 39 passes for 280 yards and a touchdown with two interceptions.

The unsavory part of his performance was the missed opportunities inside the Eagles' 25-yard line. In four tries, he was able to get the Packers into the end zone only once. The other drives resulted in two field goals, a turnover on downs and a costly interception.

"You always start with where you can get better and there are specific plays that you wish you had back," said Tolzien, who knocked around in San Diego and San Francisco after playing collegiately at Wisconsin. "The first one I think about is the pick in the end zone. We had an awesome opportunity there and got a good look for the play we were running."

It was the second quarter and the Packers were down, 7-0. The ball was at the 5-yard line and Tolzien underthrew a touch pass to receiver Jordy Nelson in the corner of the end zone. Cornerback Brandon Boykin picked it off and returned it 76 yards.