The Washington Redskins emerged from their 20-13 loss to the Philadelphia Eagles having lost starting left guard Kory Lichtensteiger to torn ligaments in his right knee, starting tight end Chris Cooley to a fractured index finger on his left hand and starting left tackle Trent Williams to a high right ankle sprain, coach Mike Shanahan said after the game.

The extent of damage to Lichtensteiger’s knee and length of his recovery are not yet known, but Shanahan said: “ACL/MCL, we’re not really sure right now, but he’s quite sore. It doesn’t look good.”

Lichtensteiger was injured on Washington’s fifth offensive play and had to be helped off the field. After he was tended to on the trainers table behind the bench, he was carted off to the locker room.

Cooley also needs surgery, Shanahan said.

Neither the coach nor Williams knew how long the ankle sprain would keep Williams sidelined, but Williams – Washington’s first-round pick from 2010 – left with his foot in a walking boot and described the pain as “excruciating.”

With Lichtensteiger out of the game, Shanahan moved center Will Montgomery to left guard and inserted 2010 seventh-round draft pick Erik Cook – who spent nearly all of last season on the practice squad – at center.

“It’s hard to lose, obviously, starters, and we’ve talked about that before,” Shanahan said. “Erik Cook, I was very proud of him. He hurt his calf before the game and couldn’t go through warm-ups, but he gutted it out, came out there and lasted the whole game for a guy that was not supposed to play, so I was pleased with him, how he was able to play.”