INDIANAPOLIS -- The Indianapolis Colts roster heading into the 2018 season (starters in bold):

QUARTERBACK (2): Andrew Luck, Jacoby Brissett

Luck has proven so far he's healthy and the Colts don't need to keep three quarterbacks. Brissett started 15 games after being acquired from New England a week before the start of the regular season last year.

Colts' revised game-by game prediction Here's how Indianapolis reporter Mike Wells sees the season playing out. Date Opp. W-L Sept. 9 vs. Bengals W Sept. 16 at Redskins W Sept. 23 at Eagles L Sept. 30 vs. Texans L Oct. 4 at Patriots L Oct. 14 at Jets W Oct. 21 vs. Bills W Oct. 28 at Raiders L Nov. 11 vs. Jaguars L Nov. 18 vs. Titans W Nov. 25 vs. Dolphins W Dec. 2 at Jaguars L Dec. 9 at Texans L Dec. 16 vs. Cowboys W Dec. 23 vs. Giants W Dec. 30 at Titans L Wells' original game-by-game prediction

RUNNING BACK (4): Jordan Wilkins, Christine Michael, Nyheim Hines, Marlon Mack

The Colts have three first- or second-year running backs on the roster. Mack is the projected starter, but he missed most of the preseason with a hamstring injury. Wilkins, who was selected in the fifth round out of Mississippi, is the front-runner to start if Mack isn't ready. Veteran Robert Turbin is suspended the first four games for violation of the NFL's performance-enhancing substances policy and does not count against the 53-man roster.

WIDE RECEIVER (5): T.Y. Hilton, Ryan Grant, Chester Rogers, Marcus Johnson, Zach Pascal

There's a lot of unknowns after Hilton, Grant and Rogers. The Colts lost rookie Deon Cain to a torn ACL on Aug. 9. Rookie Reece Fountain, who was selected in the fifth round, was signed to the practice squad. The Colts can afford to keep only five receivers because of how they use their tight ends.

TIGHT END (4): Jack Doyle, Eric Ebron, Erik Swoope, Ryan Hewitt.

Tight end is the roster's deepest and most talented position. Doyle might lead the Colts tight ends in receptions, but it wouldn't be surprising if Ebron leads them in receiving yards at that position.

OFFENSIVE LINE (10): Anthony Castonzo, Quenton Nelson, Ryan Kelly, Matt Slauson, Denzelle Good, Joe Haeg, Braden Smith, Le'Raven Clark, J'Marcus Webb, Mark Glowinski

The middle of the offensive line is set with Nelson, Kelly and Slauson. The left side will be OK, too, once left tackle Castonzo (hamstring) returns. The only position of question for the Colts is at right tackle, where nobody locked down the position throughout the preseason.

DEFENSIVE LINE (9): Jabaal Sheard, Kemoko Turay, Hassan Ridgeway, Al Woods, Denico Autry, Tarell Basham, Margus Hunt, Grover Stewart, Al-Quadin Muhammad

There's plenty of depth on the defensive line, but there's still questions about whether any of the defensive ends can provide a consistent rush. Sheard will be joined by the rookie Turay at end.

NFL Teams Cut Down Rosters Rosters rounded into shape Saturday as NFL teams trimmed down from 90 players to 53. Check out all 32 teams' cuts

LINEBACKER (6): Darius Leonard, Anthony Walker, Najee Goode, Skai Moore, Zaire Franklin, Matthew Adams

There's a lot of speed on this unit, as Leonard has made a relatively smooth transition from playing at a Football Championship Subdivision school in college last year to being a starter at outside linebacker. Moore, an undrafted free agent, has impressed many while filling in for the injured Walker (groin) at middle linebacker. Moore will start Week 1 if Walker isn't healthy.

SECONDARY (10): Pierre Desir, Kenny Moore, Quincy Wilson, Nate Hairston, Malik Hooker, Clayton Geathers, Matthias Farley, Chris Milton, George Odum, Corey Moore.

The key for the secondary is the health of safeties Hooker (knee) and Geathers (knee). There are questions at cornerback, because nobody has solidified themselves as a true No. 1 player there. Desir and Moore got most of the starting reps at cornerback during training camp.

SPECIALIST (3): Adam Vinatieri, Luke Rhodes, Rigoberto Sanchez

Vinatieri should be the NFL's all-time points leader by the time he turns 46 in December. Sanchez had a solid rookie season as Pat McAfee's replacement at punter last year when he averaged 44.8 yards.