Snow and the Cardinals kept the Eagles' screen game in check in the last two games - especially plays set up inside to tight ends and running backs - but Chip Kelly's screens, especially on first down, have been quite effective this season.

There are numerous examples, but LeSean McCoy's 44-yard catch-and-run to open the game against the Buccaneers in October and a 42-yard burst from Brent Celek last month against the Redskins both occurred on first down.

"I think the screen game can be more effective on first and second down," Eagles offensive coordinator Pat Shurmur said. "On third and long, that's obvious. Every defensive guy says, 'Watch the draw, watch the screen.' But in any situation where they're really coming after you with a pass rush, screens can be very effective."

Chris Polk revealed Thursday that he was very close to playing for Chip Kelly at Oregon.

"I was supposed to go to Oregon," Polk said. "If it wasn't Washington, it was Oregon."

Mike Bellotti was the Ducks' coach at the time, but Kelly was the offensive coordinator in 2007 when Polk visited Eugene. But the Redlands, Calif., native ultimately played for Washington.

Since as early as the NFL owners meetings in March, Kelly has included Polk in any discussion when asked about his group of running backs. He always mentions how impressed he was by the workhorse running back when Oregon faced the Huskies.

Polk has drifted under the radar for most of this season playing behind LeSean McCoy and Bryce Brown. But he busted out against the Lions, rushing four times for 50 yards, including a 38-yard touchdown.

Kelly wouldn't say Polk had stolen snaps from Brown, but he did cite his recent practice performances.

Speaking of bottom-of-the-roster players possibly moving up the depth chart, wide receiver Brad Smith (4) played more offensive snaps than Jeff Maehl (1) and Damaris Johnson (0) against the Lions.

The sample was small, but Kelly has hinted that Smith could become more of a focal point on offense. He did take a snap at quarterback against the Cardinals two weeks ago (and fumbled).

The eight-year veteran has done it all in the NFL. Smith played quarterback in college, but picked up receiver to make himself more attractive to teams around the draft. He doesn't care about titles.

"I'm just a football player first," Smith said, "and whatever I'm asked to do second."