PHILADELPHIA — If quarterback Mark Sanchez continues to play well and the Philadelphia Eagles continue to win, will coach Chip Kelly re-instate Nick Foles as the starter once he is healthy?

Sanchez played his best game for the Philadelphia Eagles Thursday, completing 20 of 29 passes for 217 yards with one touchdown throwing and another running in a 33-10 victory over the Dallas Cowboys.

Perhaps most important, Sanchez didn’t have a turnover. He had eight in the first 15 quarters after replacing the injured Foles.

The Eagles have Seattle at home next week and a return match with the Cowboys at home right after that. Somewhere along the line, Kelly must make a difficult decision regarding his starting quarterback.

The Eagles are 3-1 in Sanchez’s four starts. Foles was scheduled to have his fractured collarbone examined Friday, but probably still is another three weeks away from being cleared to play.

Kelly acknowledged Thursday that Sanchez’s play is on the ascent, as the coach expected.

“He’s just getting more comfortable,” Kelly said. “I said it earlier in the week, he missed an entire year of football (because of a shoulder injury in 2013). There’s no substitution for playing. He played well in the preseason, but then sat until the Houston game.

“I think he’s just starting to get more comfortable, starting to recognize the looks he’s getting. Sometimes he’s getting to his second receiver, third receiver, keeping things alive.

“We got him out of the pocket a few times. I thought he threw the ball well. We used him a couple of times in some run stuff so that they couldn’t gang up on the (running) back. I thought he did a nice job in the decision-making aspect of things. Keeping people honest. I thought Mark played a really clean game today.”

That said, the Eagles continue to struggle in the red zone. They converted just one of five trips inside the 20 into a touchdown against the Cowboys, and are 5-for-16 in the red zone in the last three games.

“We still left a ton of meat on the bone, man,” Sanchez said. “Gosh. We were in the freaking red zone so many times and we didn’t convert.”

The Eagles scored touchdowns on each of their first two possessions. In their last eight games, they scored 64 points on their first two possessions. They outscored opponents 85-31 in the first quarter in those eight games.

“Our guys came ready to play, played with great energy,” Kelly said.

NOTES: LB Emmanuel Acho, who injured his groin last week against Tennessee, was active for the Cowboys game, but didn’t play. … LB Casey Matthews played 38 snaps at inside linebacker, a season-high. Matthews had been rotating with Emmanuel Acho.

REPORT CARD VS. COWBOYS

–RUSHING OFFENSE: A — LeSean McCoy followed last week’s 130-yard rushing performance against Tennessee with a season-high 159-yard one Thursday, averaging 6.4 yards per carry. The Eagles’ offensive line wore down Dallas’ front seven as the Eagles finished with a season-high 256 rushing yards.

–PASSING OFFENSE: A — On the anniversary of the butt fumble, Mark Sanchez turned in a solid game in front of a national TV audience. He didn’t turn the ball over, and completed 20 of 29 passes as he was able to get outside the pocket and attack the Cowboys’ defense. Jeremy Maclin had another 100-yard receiving performance and went over 1,000 yards for the first time in his career.

–RUN DEFENSE: A-plus — The Eagles defensive line made no secret of the fact this week that they were sick of hearing about the greatness of the Cowboys’ offensive line. They went out and did something about it Thursday, winning their battles up front and helping put the clamps on NFL rushing leader DeMarco Murray, who had a season-low 73 yards and was held to 3.7 yards per carry.

–PASS DEFENSE: A-minus — Aside from giving up an early 38-yard pass to Dez Bryant, the Eagles’ secondary turned in one of its best performances of the season, shutting down Dez Bryant, intercepting Tony Romo twice and holding him without a TD. The Eagles had four more sacks, running their season total to 42.

–SPECIAL TEAMS: B-plus — Cody Parkey had four more field goals as the Eagles’ offense too often sputtered in the red zone. PR Darren Sproles averaged 10.7 yards per attempt. P Donnie Jones put two of his three attempts inside the 20. The kickoff coverage unit gave up a 42-yard return to Dwayne Harris.

–COACHING: A-plus — Chip Kelly’s tempo offense wore the Cowboys defense down. The Eagles averaged a play every 20.2 seconds in the first half. Bill Davis picked his spots with the blitz and had his defense ready for the challenge of stopping DeMarco Murray.