BALTIMORE -- Here is how the 49ers depth chart looks entering their exhibition opener Thursday against the host Baltimore Ravens (4:30 p.m., PT):

QUARTERBACK — Colin Kaepernick, Blaine Gabbert, Josh Johnson, McLeod Bethel-Thompson.

Comment: Kaepernick won't play more than a series or two, allowing Gabbert to show what progress he has made since being acquired from Jacksonville in the off-season. Johnson last appeared in a 49ers uniform in the 2012 exhibition finale, where he played great but got cut in favor of Scott Tolzien.

WIDE RECEIVER 1: Anquan Boldin, Stevie Johnson, Chuck Jacobs, Devon Wylie, Bruce Ellington.

Comment: Boldin won't make more than a cameo in his Baltimore return. No idea on how much they'll allow Johnson to show in his 49ers debut. Jacobs not only must be sure handed at wideout, but his special-teams play is what could win him a job. Ellington should make for a fun debut.

WIDE RECEIVER 2: Michael Crabtree, Brandon Lloyd, Quinton Patton, Kassim Osgood, David Reed, L'Damian Washington.

Comment: Injuries will keep Crabtree and Lloyd out. Patton showed promising signs as a rookie but may need a big preseason to solidify his job. Reed had a strong week of camp.

TIGHT END: Vernon Davis, Vance McDonald, Derek Carrier, Asante Cleveland, Kevin Greene.


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Comment: McDonald has had such a hot-and-cold camp that it could allow Carrier to leap into the No. 2 role, at least as a receiver. Cleveland and Greene have had (too) quiet camps.

RUNNING BACK: Frank Gore, LaMichael James, Carlos Hyde, Jewel Hampton, Alfonso Smith, Glenn Winston.

Comment: The exhibition season is no place for Gore's 31-year-old legs. James (right elbow dislocation) likely will skip the exhibitions. Hyde will be unveiled, but odds are that Hampton will reprise his role as the team's preseason workhorse (team-leading 113 yards in 2013 exhibitions).

FULLBACK: Bruce Miller, Will Tukuafu.

Comment: Miller looks fully healed from a fractured scapula that prematurely ended his 2013 season.

LEFT TACKLE — Joe Staley, Carter Bykowski.

Comment: Staley is too valuable to see extensive action, and the 49ers need to learn what they have in Bykowski.

LEFT GUARD — Mike Iupati, Adam Snyder, Al Netter.

Comment: Iupati has been impressive in his return from a leg fracture in the NFC Championship game, but no reason to test that leg much here. Snyder and Netter will get lots of action.

CENTER — Daniel Kilgore, Marcus Martin, Dillon Farrell.

Comment: Kilgore has had a really clean camp as the new first-string center. Martin was delayed by an ankle injury but now can show if he's a legitimate contender to start.

RIGHT GUARD — Joe Looney, Snyder, Michael Philipp.

Comment: How Looney fares could dictate how much longer Alex Boone holds out. Snyder has battled a leg injury this week so don't expect much.

RIGHT TACKLE — Anthony Davis, Jonathan Martin, Ryan Seymour.

Comment: Davis (shoulder) won't play but reported on Instagram he'll be ready for Week 1 at Dallas. Keep a close eye on Martin, who'll start and make his first foray into game action since his Dolphins exodus. Seymour was poached off the Seahawks practice squad in December (and is not a free agent guard, despite what his Wikipedia profile says).

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LEFT DEFENSIVE TACKLE: Ray McDonald, Tony Jerod-Eddie, Tank Carradine.

Comment: Carradine (No. 95) makes his debut, and aside from admiring his brute strength, 49ers coaches want to see him execute his assignments. McDonald is working through an injury. Jerod-Eddie is a coaches' favorite.

NOSE TACKLE: Glenn Dorsey, Quinton Dial, Mike Purcell.

Comment: Dorsey is out indefinitely with a torn biceps, so the 49ers need to see as much as they can from Dial and Purcell at a position that's on the field typically only 40 percent of the time.

RIGHT DEFENSIVE TACKLE: Justin Smith, Demarcus Dobbs, Lawrence Okoye.

Comment: Smith (shoulder) won't play, and that affords more snaps to his top backup Dobbs. Okoye, the former British discus thrower, plays for the first time since last exhibition season and must show he can get low and use more than a bull rush.

LEFT OUTSIDE LINEBACKER: Ahmad Brooks, Corey Lemonier, Chase Thomas.

Comment: Lemonier added 10 pounds of muscle and should look more refined since his one-sack rookie year.

INSIDE LINEBACKER: Patrick Willis, Chris Borland, Shayne Skov.

Comment: Willis' cameo will give way to necessary competition to see how well rookies Borland and Skov look as tacklers.

INSIDE LINEBACKER: Michael Wilhoite, Nick Moody, Blake Costanzo.

Comment: The process of filling NaVorro Bowman shoes, for at least half the season, starts with Wilhoite. Moody needs to exhibit his athleticism and physical play to have a chance at that job and roster spot. Costanzo returns to the special-teams corps (see: 2011).

RIGHT OUTSIDE LINEBACKER: Aldon Smith, Dan Skuta, Aaron Lynch.

Comment: Smith has been absolutely dominant in camp, but the bigger news with him comes Friday, when he reportedly will meet with NFL commissioner Roger Goodell about disciplinary measures related to his off-field issues. Skuta will deliver his typical blue-collar performance. Lynch looks imposing, but his stamina will be tested.

LEFT CORNERBACK: Tramaine Brock, Perrish Cox, Darryl Morris, Dontae Johnson.

Comment: Brock won't play. Cox has made more plays than any corner in camp -- in practice. Johnson, with his size (6-foot-2), will be most intriguing to watch.

RIGHT CORNERBACK: Chris Culliver, Chris Cook, Kenneth Acker.

Comment: Culliver, who missed all of 2013 with an ACL tear, is expected to play for the first time since the 49ers' Super Bowl loss to Baltimore. Cook, acquired in the offseason as a free agent from Minnesota, must show better ball skills than he did in his Vikings days.

FREE SAFETY: Eric Reid, Jimmie Ward, C.J. Spillman, James McCray.

Comment: Hard to believe that Reid was making his debut as a first-round pick a year ago. Now it's Ward's turn, though the 2014 first-rounder is likely to play just play nickel back in this one.

STRONG SAFETY: Antoine Bethea, Craig Dahl, Bubba Ventrone, D.J. Campbell.

Comment: Say hello to Donte Whitner's replacement, a similar-sized Bethea. Dahl and Ventrone are special-teams aces.

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PUNTER: Andy Lee, Colton Schmidt.

Comment: Lee is entering his 11th season, and his leg will get relief from Schmidt for a second straight preseason.

KICKER: Phil Dawson, Schmidt. Comment:

Most pertinent to Dawson's exhibition season are the next two games, when he can get a feel for Levi's Stadium.

PUNT RETURNER: Cox, Ellington, Patton.

Comment: Cox has looked the most fluid in practice, but Ellington seems ticketed for this role, at least until James is healthy.

KICKOFF RETURNER: Cox, Hyde, Ellington.

Comment: Again, Cox seems comfortable back there, a lot more so than Hyde, who has fumbled a lot in practice.

LONG SNAPPER: Kevin McDermott, Kyle Nelson.

Comment: McDermott is entrenched since unseating Brian Jennings last preseason.

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Physically-unable-to-perform list: LB NaVorro Bowman, TE Garrett Celek, NT Ian Williams, DT Kaleb Ramsey.

Non-football-injury list: RB Marcus Lattimore, FB Trey Millard, CB Keith Reaser, G Brandon Thomas.

Injured reserve list: RB Kendall Hunter, G Fou Fonoti.

For more on the 49ers, see Cam Inman's Hot Read blog at blogs.mercurynews.com/49ers. Follow him on Twitter at twitter.com/CamInman.