The Colts have had offensive line issues, particularly at the guard spot, the last few years. So, they're hoping that veteran Matt Slauson (1 year, $3 million) can help fix a glaring need:
Slauson has nine seasons of NFL experience and has started in every game he's ever appeared in, making 108 total starts for the Jets, Bears, and Chargers. His time in San Diego/L.A. overlapped with new Colts' offensive coordinator Nick Sirianni, as the two spent their last two seasons together while Sirianni was an offensive position coach (receivers).
The veteran is 32 years old, which means he's not a long-term solution at guard, but as Nat Newell of the IndyStar pointed out, the Colts have been a revolving door at both guard spots, so hopefully Slauson can lock one of those down.
There is a downside to Slauson, though: he hasn't graded well. Pro Football Focus rated him as the 49th best guard this past season. However, the good news? Jeremy Vujnovich, a 16-game starter for the Colts last year, was one of the worst-rated guards in the entire league (77th), so Slauson is automatically an upgrade. Yay!
Even if he can't start, with his experience and just a one-year, low-cost deal, just having him fill out the depth chart is better than nothing. I'm still hopeful that the Colts bring back Jack Mewhort and add another guard via the draft, but I'm guessing Slauson will be given a chance to win a starting spot.