1. Anthony Castonzo
Despite such a rough season from the offensive line, Anthony Castonzo was one of the lone bright spots. He's proven to be an effective run-blocker and while he hasn't been the most consistent left tackle in pass protection, he hasn't been the problem.
2. Jack Breckner
Ryan Grigson is known for casting a wide net when it comes to adding players, and he's hoping he found another hidden gem in Jack Breckner. Breckner recently played in the Arena Football League and he's an intimidating person at 6'9" and 320 pounds.
Hopefully Breckner won't have to play left tackle, but it will be interesting to see how effective he can be, given his size, if he's forced to play.
1. Donald Thomas
Colts fans can rejoice at the fact that the team might finally have some help on the interior of the offensive line. They signed Donald Thomas last year, but he got hurt in the very first game. Now, he'll have a chance to show just how good he is and, hopefully, keep Luck upright.
2. Joe Reitz
Although he didn't played much last season, Joe Reitz was effective when out on the field in both run and pass-blocking. He'll probably start the season on the bench but if Hugh Thornton struggles, he might end up playing opposite of Thomas.
1. Phil Costa
Cutting Samson Satele meant that the Colts were going to have to look for some help at center. Instead of pursuing someone like Alex Mack or Brian De La Puente, the Colts decided to bring in Phil Costa.
Costa started every game for the Dallas Cowboys in 2011, but he then dislocated his ankle at the beginning of 2012. The starting job is wide open in Indianapolis, so we will see if Costa can be effective enough to be the new starter.
2. Khaled Holmes
It feels like there are a lot of questions surrounding Khaled Holmes entering this season. Cutting Satele means that Holmes has a chance to become the starter, yet he was almost always a healthy scratch before games this past season. According to Pro Football Focus (subscription required), he played in just 13 snaps last year.
Holmes has a chance to become the starter, but he's going to have to prove himself.
1. Hugh Thornton
Thornton had a very rough rookie season, giving up seven sacks and 16 quarterback hits, which was more than anyone else on the team in either category, per PFF. With Mike McGlynn gone, Thornton will still have a starting job, but he could lose it quickly if he doesn't improve in 2014.
1. Gosder Cherilus
Gosder Cherilus might have been an expensive signing last offseason, but he was definitely a big upgrade at right tackle. Assuming he continues to play like this, he'll probably be the starting right tackle for the next few seasons.
2. Xavier Nixon
Xavier Nixon did about as good as you'd expect a young backup offensive tackle having to start a few games last season. That's not saying a lot, but he'll be a serviceable backup.