Chip Kelly's moves leave offensive line without depth

PHILADELPHIA -- Chip Kelly’s offseason moves left the Philadelphia Eagles with little depth along the offensive line. Four games into the regular season, that depth has been stretched dangerously thin.

Left tackle Jason Peters left Sunday’s game with an injured quadriceps. Peters was listed as questionable for Sunday’s game because of the injury. He aggravated it during the game. Matt Tobin finished the game at left tackle.

Right tackle Lane Johnson had MRI exams on his left knee and ankle. Johnson had been playing on a sprained medial collateral ligament in the knee since the preseason. He is expected to continue playing despite the injuries, according to ESPN's Adam Caplan.

Left guard Andrew Gardner is already on injured reserve. Tobin has replaced him in the starting lineup. With Peters out, Tobin moved to left tackle and Dennis Kelly stepped in at right guard.

“There’s not a bunch of O-linemen on the street,” Kelly said. “Everybody’s on their different teams at this point in time. You hope that JP [Peters] is healthy this week and can go. If not, we’ve got to go with what we’ve got.”

Center Jason Kelce and left guard Allen Barbre are the only members of the original starting line unaffected by injuries so far.

Kelly released the Eagles’ starting guards during the offseason. Todd Herremans was released in March and Evan Mathis was released in June after skipping voluntary workouts because he was unhappy with his contract.

“It’s not a lesson learned,” Kelly said. “We weren’t going to renegotiate his contract. I’ll say it again: We were told by his agent that if we didn’t renegotiate it, we weren’t getting him back.”

The Eagles have not taken an offensive lineman in the last two NFL drafts. They have not signed any first-tier free agents over the last few years, either.

Kelly’s plan was to go with Barbre and Gardner as the replacements for Mathis and Herremans. The offensive line has not been effective over the first three games. The loss of Gardner and backup center David Molk has left that already-thin unit without many options.