In the second quarter of his team's Week 4 game against the Washington Redskins, McFadden was forced from the field with a hamstring injury, and the team's official Twitter feed dubbed him "questionable" to return:
Although the severity is still unknown, hamstring injuries tend to linger. For fantasy purposes, the guy you now want to target—if you or someone in your league didn't already handcuff the oft-injured McFadden—is Jennings.
In PPR leagues, the pride of football-powerhouse Liberty University is someone you're going to want to run—not walk—to pick up. He pulled in 1.6 receptions per game despite being the backup in Jacksonville the last four years, and he already had four catches for 28 yards in the first half after replacing McFadden on Sunday.
In non-PPR leagues, target him in 12-team leagues as we await clarification on McFadden's status and how much time he'll miss, if any.
Jennings averaged 4.3 yards per carry—although that number was brought down significantly by a miserable 2012 season in which all of Jacksonville was pretty much a train wreck—with the Jags and has run effectively in limited opportunities with the Raiders this season.
Keep a close eye on this situation. Jennings—especially once Terrelle Pryor returns and adds some dynamism to the offense—is someone with plenty of talent who can instantly help your team if McFadden is forced to miss any time.