CBS 4's Mike Chappell reports Colts C Ryan Kelly will be out a "few weeks" with a foot injury.
A "few weeks" might be the best possible outcome after Kelly was sporting crutches following Thursday's practice. It would be good to have a firmer timeline, but it sounds like he will be back for Week 1. With basically nothing behind him on the depth chart, the Colts need Kelly to stay healthy.
http://www.rotoworld.com/player/nfl/11304/ryan-kelly

Hopefully he's back by week 1.