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Even before official word came Wednesday afternoon that Colts quarterback Andrew Luck would miss Thursday night’s game vs. the Steelers due to a concussion, we knew Scott Tolzien was next in line for the Colts.

If you’re wondering who Tolzien is, you’re probably not alone.

He’s a sixth-year pro who went undrafted out of Wisconsin, where he was a two-year starter. He broke into the league with the Chargers in 2011, then was claimed by the 49ers at the end of his first preseason. Tolzien was the third-stringer on the 49ers’ 2012 Super Bowl team but got cut the following August and landed in Green Bay, first on the practice squad.

The Packers had a rash of quarterback injuries in 2013, and that’s when Tolzien got his first game action. He played in three games and started two, and he threw for 339 yards — but was intercepted three times — in his first NFL start.

Strangely, Tolzien’s last start came exactly three years from Thursday, on Nov. 24, 2013 vs. the Vikings. He struggled, going 7-of-17 for 98 yards as the Packers and Vikings tied, 26-26.

Not many quarterbacks have a career record of 0-1-1. In fact, there is probably only one.

He played in three games as a backup for the Packers last year but didn’t throw a pass, then signed a two-year deal with the Colts in the offseason. After Luck’s injury issues last season, the Colts knew they needed to upgrade their backup quarterback situation, and Tolzien will get at least one game to prove himself and try to help keep the Colts’ playoff hopes alive.

Earlier this week, Colts coach Chuck Pagano said he has “all the confidence in the world” in Tolzien.

Thursday night, a much bigger portion of the football world will know Tolzien than does right now.