Source: Nick Foles to start

Philadelphia Eagles rookie quarterback Nick Foles will start against the Washington Redskins on Sunday, a source told ESPN NFL Insider Adam Schefter, after Michael Vick was diagnosed with what coach Andy Reid called a "pretty significant concussion."

Foles, a third-round draft selection, made his NFL debut in relief of Vick during this past Sunday's loss to the Dallas Cowboys and earned positive reviews from Reid.

Although Reid emphasized that Vick is still Philadelphia's starter if healthy, the Eagles will go with Foles against Washington, a source close to the situation told Schefter.

"I've got confidence that Nick will do a nice job, if given that opportunity," Reid said Monday. "Listen, I get excited for every game, but if the kid has an opportunity to start, I'm excited to see him play."

Vick suffered the injury early in the second quarter and was ordered to stay home Monday and rest, according to Reid.

"He was a little foggy last night," Reid said. "Mike has a headache is what he's got -- a pretty good one. He's tired. One of the things that is important is that he gets rest."

Reid acknowledged that Vick likely won't be medically cleared by the time the Eagles resume practice Wednesday and said that Foles will receive all of the snaps with the first-team offense.

Foles was 22-of-32 for 219 yards with a touchdown and an interception against the Cowboys but could not help the Eagles (3-6) avoid their fifth straight loss, a first in Reid's 14 seasons in Philadelphia.

Eagles fans had rooted for Foles, who enjoyed an outstanding preseason, to replace Vick for weeks. The rookie received a loud ovation at Lincoln Financial Field when he entered Sunday's contest.

Reid's job is in serious jeopardy, and turning to Foles over the final seven games could be the veteran coach's way of proving he's open to change to salvage his 14th season. Reid and the Eagles took a gamble in 2009 when they signed Vick with incumbent Donovan McNabb and onetime heir apparent Kevin Kolb already on the roster.

The Eagles traded McNabb to Washington the following offseason, opening the door for Kolb, who suffered a concussion in Week 1 of the 2010 season and was replaced by Vick.

Two years later, it could be Vick's turn to lose his job because of a head injury.

Vick sustained a concussion in a September 2011 game against Atlanta but returned to start the following week against the New York Giants, only to suffer a broken right hand.

His outlook appeared much more grim Monday than last season's injury -- Reid stressed several times just how badly Vick was hurt.

Vick, 32, has struggled this season with 11 touchdowns and nine interceptions. After a loss two weeks ago to the Falcons, Reid refused to endorse Vick as the starter, needing a couple of days before releasing a statement that there would be no change at quarterback.

Sunday's loss to the rival Cowboys was another black mark on the season, and time is running out to save Reid's job. Eagles owner Jeffrey Lurie put Reid on notice following an 8-8 season that he had to win big to earn a 15th season.

Fans are clearly fed up. In the final minutes of Sunday's loss, fans behind Dallas' bench unrolled a banner that read, "Andy, Quit, Your Team Has!" Other ticked-off fans brought "Fire Andy!" and "This Is Not Acceptable" signs with them as they tailgated in the parking lots. There was at least one mobile billboard that read "Fire Andy Reid Now!!!" and "No Mas" with a pair of red X's near the embattled coach's photo.

Reid insisted Monday he hadn't lost his enthusiasm for coaching the Eagles ("I love what I do") and put a dose of positive public relations spin out there that a playoff berth is still within reach.

"You don't count anybody out in the National Football League, so I'm surely not going to count this football team out," Reid said. "I feel good about this team as a group, and we just need to tighten some things up."

Information from The Associated Press was used in this report.