But first, a couple notes: these depth charts are, indeed, unofficial. Each NFL team is required to publicly release its depth chart the week leading up to a game, and lots can change over the course of the next few days. Also, the players listed as "starters" aren't necessarily those who will start the upcoming game; case in point: injured players who remain on the 53-man roster are usually listed on the depth chart, too.

So, without further ado, let's take a look at this week's unofficial depth chart:

OFFENSEWR1:T.Y. Hilton, Chester Rogers, Quan Bray

LT:Anthony Castonzo, Le'Raven Clark

LG:Jeremy Vujnovich

C:Ryan Kelly, Deyshawn Bond, Ian Silberman

RG:Jack Mewhort, Joe Haeg

RT:Denzelle Good, Le'Raven Clark

TE1:Jack Doyle

WR2:Donte Moncrief, Kamar Aiken, Matt Hazel

QB:Andrew Luck, Scott Tolzien, Jacoby Brissett

TE2:Brandon Williams, Darrell Daniels

RB:Frank Gore, Robert Turbin, Marlon Mack, Matt JonesNotes:•One primary change from the preseason depth chart is along the offensive line. Previously, the starting five listed in the unofficial depth chart were Castonzo at left tackle, Haeg at left guard, Kelly at center, Mewhort at right guard and Clark at right tackle. As it stands on the Week 1 unofficial depth chart, Vujnovich — who started at left guard the first preseason game this year before starting at right tackle the next two games, and then sitting out the fourth contest — is now listed as the No. 1 left guard, while Denzelle Good — who started at right guard the last two preseason games — is listed as the No. 1 right tackle.

• Staying at the offensive line, general manager Chris Ballard said that although Kelly is "close" to returning from foot surgery, he is still considered week-to-week, meaning the undrafted rookie Bond is in line to start his first-career game on Sunday.

• At quarterback, Ballard announced Monday that Tolzien will start Sunday vs. the Rams, and that Luck will be out as he continues to work his way back to the field after undergoing offseason shoulder surgery. That leaves Jacoby Brissett as the team's backup, eight days after the team acquired him in a trade with the New England Patriots.

• With No. 2 tight end Mo Alie-Cox now on Injured Reserve as he recovers from a knee scope, 2017 free agent pickup Brandon Williams slides into his spot on this week's unofficial depth chart, followed by Daniels.

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DEFENSEDE:Henry Anderson, Margus Hunt

NT:Al Woods, Grover Stewart

DT:Johnathan Hankins, Hassan Ridgeway

SLB:John Simon, Barkevious Mingo

MIKE:Antonio Morrison, Anthony Walker

WILL:Jon Bostic, Jeremiah George

RUSH:Jabaal Sheard, Tarell Basham

LCB:Rashaan Melvin, Quincy Wilson, Chris Milton

SS:Matthias Farley, T.J. Green

FS:Darius Butler, Malik Hooker

RCB:Vontae Davis, Nate Hairston, Pierre Desir, Kenny Moore IINotes:

• No huge surprises with the defense for Week 1's unofficial depth chart. In fact, the starters listed this week are the exact same as the defensive starters listed for the Colts during the preseason.

• With Davis out for the next few weeks with a groin injury, according to Ballard, look for Melvin, Wilson, Hairston and Green — who is learning to play the position after beginning his career at safety — to immediately step in, head coach Chuck Pagano said, with guys like Milton, Desir and Moore II also possibly getting in-game opportunities to show what they can do.

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SPECIALISTSP:Rigoberto Sanchez

K:Adam Vinatieri, Rigoberto Sanchez

H:Rigoberto Sanchez

LS:Luke Rhodes

KR:Quan Bray