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1. Marcel Reece, Oakland Raiders
Until Darren McFadden returns from his ankle injury, Reece is a must-have player at running back. Heck, even when McFadden does return, I can't see how Reece doesn't continue to get touches.
He was exceptional in Weeks 9 and 10, but he had his best game of the season last week against the New Orleans Saints. His 193 total yards (103 rushing and 90 receiving) were a thing of beauty.
Reece has definitely earned some consideration as more than just a flex player moving forward, and he could certainly be the key to winning your league this year.
2. Ronnie Hillman, Denver Broncos
With Willis McGahee out for up to eight weeks with a torn MCL, Hillman now becomes the primary ball-carrier in Denver.
While he'll split some carries with Lance Ball, he should still see the majority of snaps in the upcoming weeks. The only concern with Hillman is that the Broncos could easily decide to just let Peyton Manning throw the ball 60 times a game for the remainder of the season.
That isn't the likely scenario, however, and Hillman should be a great flex option for the remainder of the season.
3. Jalen Parmele, Jacksonville Jaguars
Rashad Jennings got the boot in Week 11, and now, Parmele is the No. 1 back on the depth chart until the return of Maurice Jones-Drew.
We don't really know much about Parmele, but the ability to pick up any legitimate starting running back for a team this late in the season is huge. This week will be a great week to gauge exactly what he can bring to your roster due to his matchup with the Tennessee Titans.
If he plays well this week, you can expect more of the same moving forward.
4. Bryce Brown, Philadelphia Eagles
LeSean McCoy suffered a concussion last week, and his status for Week 12 is still unknown. However, with the Eagles' season in ruins, I can't see them rushing McCoy back onto the field.
That means that Brown will get a chance to see the majority of the snaps this week. He's shown brief flashes of the potential that made him such a coveted high school recruit, but we don't know if he can do that consistently over the course of a full game.
Brown is likely to only be a one-week wonder, but he could be extremely helpful in assuring a win this week for your team.
5. Beanie Wells, Arizona Cardinals
Wells will finally be back for his Week 12 matchup against the St. Louis Rams. The only reason he ranks so low on our list of waiver-wire additions is because there are major questions surrounding the offensive line in Arizona.
Also, until we see what Wells can do on the field, we'll wait to consider him a must-have player. However, if he plays well this week and is still available in your league for Week 13, you'll definitely want to make a move on him.