How will the Eagles replace LeSean McCoy?

The Philadelphia Eagles rocked the league Tuesday when they agreed to swap star running back LeSean McCoy for Buffalo Bills LB Kiko Alonso. The trade was shocking; player-for-player moves are rare in the NFL, but McCoy was viewed by many as the best player on the Eagles' offense. Now, Philadelphia must adjust to life without its electric backfield presence.

Darren Sproles - The most experienced tailback remaining in Philly's stable, Sproles is as creative in space with the ball in his hands as any player in the league. Still, he's not a bell cow; the Eagles can only feed him a limited diet of touches before risking a dropoff in production or serious injury.

Chris Polk - Polk isn't a household name, or even a particularly dynamic running back. Still, he gained more than 1,000 yards each of his three years as a starter at the University of Washington and offers a decent size-speed combination (5'10, 215 pounds, 4.57-second 40-yard dash) that Kelly has rarely had during his time at Oregon or Philadelphia. He got some goal line work for the Eagles last season and finished with four touchdowns and 3.7 yards per carry on 46 attempts.

Kenjon Barner - Barner has six NFL carries to his name, none of them coming while a member of the Eagles. Still, Kelly is familiar with him from their shared time at Oregon, where Barner rushed for 1,767 yards as a senior. He doesn't possess great size or speed, but he does a little bit of everything.

C.J. Spiller - One of the interesting twists of the McCoy-Alonso trade is the sudden availability of Spiller, a dynamic ball carrier that languished in Buffalo behind a bad offensive line. Spiller has shown in the past that he can challenge a defense much in the same way McCoy can. He'd be an interesting option in Kelly's offense behind the Eagles' talented offensive line.

Mark Ingram - Ingram is an undersized power back with decent hands and limited wear for a fourth-year player. Though his pass catching skills may turn off the Eagles, he could prove a solid inside rusher who can tote the rock 20 times a game or more if needed.

Reggie Bush - Though no longer the elite athlete he was at USC, Bush has a versatile skillset that matches Philly's offense. Just as importantly, he shouldn't command a huge price tag at this point in his career.

DeMarco Murray - His asking price probably takes him out of consideration, but Murray demonstrated last year that he can stay healthy for a full 16-game slate. When that happens, he's one of the most productive runners in the game. Still, would the Eagles trade away McCoy only to end up with another expensive ball carrier?

NFL draft

Melvin Gordon - Purely as a runner, Gordon plays with similar explosiveness to McCoy and can make defenders look silly by dodging tackles. However, Gordon has yet to develop as a receiver, an issue that would cloud his future with the Eagles. If Kelly and company are willing to wait for that part of his game to mature, he could be an option at the 20th pick.

Ameer Abdullah - Abdullah can do it all. He's a dynamic runner as well as pass catcher who served as the engine for the Nebraska offense. However, he has struggled with ball control throughout his college career. Given his small hands (8 5/8"), that's unlikely to change in the NFL.

Jeremy Langford - From a purely athletic standpoint, Michigan State's Langford projects favorably in the Eagles' offense. He possesses homerun speed and good size. However, he has endured nearly 600 carries over the past two seasons and has never been much of a receiver. Like other prospects, Philly would need time to develop Langford into a more complete back.