Last Monday, right guard Johnnie Troutman was hopeful he'd return to the field within weeks.
Tuesday -- two days after nearly all eight active offensive linemen suffered some kind of minor or major injury in the Vikings game -- he learned he wouldn't return at all.
Troutman, who started 15 games last season for the Chargers, suffered a forearm injury in early August during the preseason opener against the Dallas Cowboys. He was inactive for the team's first three regular-season games because of the injury, but kept on the roster in hopes he would make a speedy enough recovery.
It's a blow for Troutman, who was signed in the fifth round of the 2012 draft and spent his entire rookie season on injured reserve because of a pectoral tear.
The Chargers need the space on their roster, though.
Center Chris Watt is still nursing a groin injury. Left tackle King Dunlap suffered a concussion in Sunday's game. Left guard Orlando Franklin seems to be dealing with an ankle injury, as is right guard D.J. Fluker.
So, general manager Tom Telesco added some depth Tuesday, promoting tackle Tyreek Burwell from the team's practice squad and signing veteran center J.D. Walton.
Walton, 28, started all 16 games at center for the New York Giants in 2014. At 6-3, 305 pounds, he blocked for a ground game that rushed for more than 1,600 yards and a passing game led by quarterback Eli Manning, who threw for more than 4,400 yards last season.The Oklahoma native was drafted by the Broncos in 2010 as a third-round pick and spent three-plus seasons in Denver under Chargers head coach Mike McCoy, who was with the Broncos at the time as the team's offensive coordinator. He did not play in 2013 (and missed most of 2012) because of ankle injuries.
Walton will wear No. 66 for the Chargers.
In corresponding moves, tight end Kyle Miller was waived and guard Michael Huey was re-signed to the team’s practice squad.