Lions released RB Eldra Buckley and signed RB Kevin Smith.

These were depth moves. The Lions are obviously not happy with Eldra Buckly as RB depth after losing Jerome Harrison for the season.

Lions RB Jerome Harrison (illness) was added to the injury report Thursday after missing practice. He has been diagnosed with a brain tumor which was caught during his physical with the Eagles. It resulted in the Ronnie Brown trade being nullified.

The Lions are searching for answers after the Ronnie Brown trade was nullified yesterday due to Jerome Harrison's physical.

Maurice Morris and Keiland Williams shared reps at practice Wednesday, with Morris working with the first team. He likely will start Sunday if Jahvid Best cannot play.

"Maurice has answered the bell anytime that it's rung for him," Schwartz said. "He's been a very productive runner for us and we know that he'll do well if he plays on Sunday and Keiland has shown some really nice things. A little bit more short-yardage and goal line and things like that, but that doesn't mean that's the only thing he can do.

"He played a lot of third down back for the Redskins last year. He's done some really nice things for us and, no matter who we're handing the ball to, we expect them to gain yards and be able to make explosive plays for us."

Morris is the guy to own in the Lions' backfield if Best can't play. Williams will rotate in, but we expect Morris to lead the team in touches while Best is sidelined. He's not anywhere as explosive as Best, but he might be a better between-the-tackles runner.

The Detroit Lions' deadline deal to acquire running back Ronnie Brown is off.

ESPN reported that the Lions' trade of Jerome Harrison and a 2013 draft pick to the Philadelphia Eagles for Brown has been voided because of a health issue surrounding Harrison. The Lions confirmed only that the deal fell through.

Asked his feelings on the deal falling apart, Brown said via text message, "Lost for words."

This will have a big impact on waiver wires across the country, as Maurice Morris becomes the obvious pickup for owners trying to account for Jahvid Best's concussion situation. It seems likely that Best misses Week 7, and we see Morris as the lead back with Keiland Williams rotating in and getting some third down work. Harrison probably won't be a factor given the way he fell out of favor with the Lions this season. James Davis has been added to the Lions' practice squad. Back in Philly, Brown re-joins an Eagles backfield as the RB3 behind LeSean McCoy and Dion Lewis.

The Ronnie Brown experiment in Philadelphia is over as the Eagles traded the underperforming running back to the Detroit Lions for running back Jerome Harrison and an undisclosed 2013 draft pick.

With Jahvid Best suffering from a concussion, and the Lions generally weak between the tackles, Ronnie Brown should fill the need of early down runner, and possibly more if Jahvid Best misses significant time (he very well may not). It remains to be seen exactly how Brown will platoon with Maurice Morris and Keiland Williams, but we doubt he is handed the keys in his first week with the team.

Jahvid Best sustained a concussion, his second of the year.

The Lions did confirm that Best was concussed.

Best had a run of concussion-related issues during his junior season at Cal, as well, so the team will proceed with caution.

Maurice Morris took over for Best and gained 20 yards on five carries and would probably be heavily involved in the running game going forward if Best misses time. Keiland Williams and Jerome Harrison are other RBs on the roster. We'll continue to keep you posted as the week goes on.

The Detroit Lions have signed running backs Mike Bell and Jerome Harrison to back up Jahvid Best.

Can you say Running Back By Committee? After Jahvid Best, the Lions backfield is a fantasy nightmare.

Eagles QB Michael Vick (thigh) is not expected to play in week 17. Kevin Kolb will likely get the start with the Eagles aiming to get healthy for the playoffs. DeSean Jackson (foot) is also expected to get the day off. LeSean McCoy and Jeremy Maclin could see limited playing time. Look for Jerome Harrison, Jason Avant & Riley Cooper to get extensive playing time.

"We've got a plan [for RB Jerome Harrison]. Looks like he's picking up our system pretty well," said Eagles offensive coordinator Marty Mornhinweg.

Harrison will probably emerge as the RB2 on the Eagles at some point. A position Mike Bell held, but was rarely used. The Birds should feel pretty good about giving Harrison carries as the season goes forward to ease the workload on McCoy, who is still playing with a fractured rib. The Eagles apparently did not feel good about giving Bell carries. McCoy is still the unquestioned RB1, though.

The Eagles swapped backup running backs with the Cleveland Browns, exchanging Mike Bell for Jerome Harrison. Bell really wasn’t a very good fit for the Eagles’ offense, being strictly a between-the-tackles runner. He wasn’t much of a pass-catcher. The 5-9, 208-pound Harrison is a better fit. He’s got speed to run outside. He is a decent receiver. But he’s coming from a totally different offensive system, which means he probably won’t be able to help the Eagles right away.