Based off of team pre-game warmups, it appears as though Will Holden and Chaz Green will be starting at left and right tackle for the Indianapolis Colts respectively in the absence of bookends Anthony Castonzo and Braden Smith on Sunday against the Pittsburgh Steelers:
Colts tackles in initial warmups: Chaz Green on the right, Will Holden on the left.
Interior OL looks like it normally does.
So from left to right: Holden, Nelson, Kelly, Glowinski, Green— Joel A.