Eagles general Manager Howie Roseman says rookie safety Earl Wolff will miss "multiple weeks" with a knee injury that forced him to leave Sunday's game against Green Bay.

Eagles head coach Chip Kelly gave a prognosis that was neither definitive nor optimistic when he gave his day-after press conference on Monday.

"I'm not an expert, so I just defer to those guys," Kelly explained.  "I always defer to the doctors and training staff to tell us how long they're in, how long they're out.  Sometimes they look a little bit worse than they are."

Patrick Chung, who started the season as the starter at safety, moved into the line-up and didn't skip-a-beat once Wolff left and finished the game with five tackles and broke up a pass.

"You can tell when their opportunity comes, do they take advantage of it?  Those guys did, which is exciting about our depth, because we know we're going to get tested again as the season continues to wear on," Kelly stated.

Peters returning

Kelly said tackle Jason Peters should play this week against Washington. If Peters starts, Philadelphia would have its ideal starting offensive line intact for every game this season.

"Jason said he's going to play," admitted Kelly.  "But every time Jason’s had anything, he's told me he's going to play.  But the one thing about Jason is he has played.  He hasn't missed any time since I've been here."

Peters left Sunday's game at Green Bay in the first quarter with a quad injury and did not return.  He entered the Packers game with a pectoral issue, went to the locker room early on to get checked for a concussion and then came back in only to limp off with a quad strain.

However, in his absence, one bright spot was the play of back-up tackle Alan Barbre.

"I thought he did a really, really good job in his first extended playing time, was really solid in protection, kind of helped us get to the edge a lot when we were running to the left.  So really happy with him," Kelly said.

Vick to Sit

Speaking Monday, coach Chip Kelly confirmed Nick Foles will remain the Eagles' starting quarterback at least for the time being.  Opening day starter Mike Vick is still being slowed by a hamstring injury.

Kelly gave no indication on when Vick would be ready to play.

"I don't think he'll go," Kelly said about Vick at practice.  "He'll try to test it.  He ran.  I watched him.  He got a good workout yesterday at Lambeau running around a little bit.  He said it feels better.  He will not be full tomorrow.  We'll see if we can get a feel for what he can do and what he can't do.  I know he won't be full tomorrow."

Kelly also indicated that there was no reason to name someone the starter, to him the plan the have followed the past few weeks seems to be working.

"I think what we've done for the last two weeks has worked for us pretty good, so we're going to stick with that formula," Kelly joked.  "It's got us 16 touchdowns, no interceptions and two wins, so why would we change?"

Note

• ILB Mychal Kendricks also left Sunday's game – a knee injury forcing him to leave for good – but Kelly said Kendricks felt good, and he didn't think there was anything big‑time wrong with him.