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49ers could be without Ian Williams when season opens vs. Rams

The San Francisco 49ers open training camp on July 30 at SAP Performance Facility in Santa Clara, California. Here's a starting lineup projection:

OFFENSE

Quarterback (Blaine Gabbert): Engineered two fourth-quarter comebacks in 2015, one more than he did his entire time in Jacksonville.

Running back (Carlos Hyde): Averaged 4.1 yards a carry in his first two NFL seasons but is coming off a foot injury that forced him to miss nine games last season.

Receiver (Torrey Smith): Caught a career-low 33 passes in 2015 but led the NFL with 20.1 yards per catch.

Receiver (Bruce Ellington): Former fourth-round draft pick has 42 receptions in two NFL seasons.

Receiver (Quinton Patton): Played in 16 games for the first time in his career and finished third on the team with 30 receptions.

Tight end (Vance McDonald): Caught all three of his touchdowns in 2015 after Gabbert replaced Colin Kaepernick as the starting quarterback.

Left tackle (Joe Staley): Five-time Pro Bowl pick has not missed a game since 2010 and has started all 130 games in which he has played.

Left guard (Zane Beadles): Former Pro Bowl lineman signed a three-year, $9.75 million deal with the 49ers after being cut by Jacksonville.

Center (Daniel Kilgore): Finally seems to be past the leg injury that limited him to 10 games the past two seasons.

Right guard (Joshua Garnett): Second-round draft pick will have to beat out Brandon Thomas for the job.

Right tackle (Trent Brown): Hulking 355-pounder started final two games of 2015.

DEFENSE

Left defensive end (Arik Armstead): Had 19 tackles and two sacks as a rookie last year.

Nose tackle (Ian Williams): A force in the middle but might not be ready for opener after offseason ankle surgery.

Right defensive end (DeForest Buckner): Seventh overall pick in the draft had 67 defensive pressures in final college season.

Outside linebacker (Eli Harold): Will hold down the spot until Aaron Lynch completes four-game NFL suspension.

Outside linebacker (Ahmad Brooks): Has tied for the team lead in sacks each of the past three seasons.

Inside linebacker (NaVorro Bowman): Led the NFL in tackles one year after serious ACL injury.

Inside linebacker (Gerald Hodges): Made 39 tackles over final four games of 2015.

Cornerback (Tramaine Brock): Has to be looking over his shoulder after offseason trade rumors and the addition of three DBs in the draft.

Cornerback (Jimmie Ward): First-round pick in 2014 was in and out of the starting lineup in 2015.

Safety (Antoine Bethea): He was a 2014 Pro Bowl pick but missed nine games in '15 because of a torn pectoral muscle.

Safety (Eric Reid): Coming off a down year after making a combined seven interceptions in 2013 and 2014.

Punter (Bradley Pinion): Second-year punter tied for sixth with 31 punts inside the 20-yard line.

Kicker (Phil Dawson): The 41-year-old is third among active kickers with 457 career field goals.

Long-snapper (Kyle Nelson): Has not missed a game since taking over in 2014.

KR/PR (Bruce Ellington): Averaged 7.2 yards on punt returns and 25.6 on kickoff returns.