The Colts placed starting offensive lineman Matt Slauson on injured reserve on Monday with what was an unknown injury at the time.
By Wednesday, the mystery was solved. According to Zac Keefer of The Indianapolis Star, Slauson broke two vertebrae in his spine during Thursday's 38-24 loss to the Patriots.
It would have been really easy to miss when Slauson sustained th injury because he played all 83 offensive snaps for the Colts that game and had five additional plays on special teams. The injury occurred early in the third quarter, and although Slauson played through it just fine, he was one hit away from potentially being paralyzed.