Adrian Peterson was forced out of Sunday's game against the Baltimore Ravens with an injured foot, leaving Gerhart to be Minnesota's true featured back. He thrived in the role, rushing for 89 yards with one touchdown while scoring a solid 12.9 fantasy points. If Peterson is forced to miss action, the Stanford product would become an instant flex starter for fantasy owners in Week 15 against the Philadelphia Eagles.

Reggie Bush aggravated a calf ailment in pre-game warmups and was unable to go against the Philadelphia Eagles, leaving Bell to take on the backfield load for Detroit. He did well in the stat sheets, totaling 127 scrimmage yards, one touchdown and 16.7 fantasy points. Bush hasn't been the most durable runner in his career, so Bell becomes a nice option off the waiver wire. He'll face off against the Baltimore Ravens next.

The Dolphins lost Lamar Miller to a concussion in Sunday's win over the Pittsburgh Steelers, leaving Thomas as the team's preferred backfield option. He played well, rushing for 38 yards (4.2 YPC) with one touchdown while scoring 10.2 fantasy points. Should Miller be sidelined for a Week 15 matchup against the New England Patriots, the veteran out of Kansas State would instantly become a viable flex starter in all formats.

A waiver-wire hero for owners in 2012, Reece is now back on the radar after posting 161 scrimmage yards and one touchdown in a loss to the New York Jets. He saw a monster workload in the absence of both Rashad Jennings (concussion) and Darren McFadden (ankle), who have to be considered questionable for Week 15 at this point. Regardless, Reece is someone to grab if you're looking for some help at the running back position.

Pitta made a serious impact in his first game of the 2013 season, catching six passes for 48 yards with one touchdown while scoring 10.8 fantasy points in a win over the Minnesota Vikings. A talented pass catcher, he was a statistical star during Baltimore's championship run last season and could be a No. 1 fantasy tight end over the next few weeks. If you're really hurting at the position, Pitta is a tremendous option.

Streater has become the top option in the pass attack for quarterback Matt McGloin, posting 84 or more yards and two touchdowns in three of his last four contests. He was a statistical beast against the New York Jets, catching seven passes for 130 yards with one touchdown and 19 fantasy points. Streater needs to be owned in all leagues and in the discussion as a viable No. 3 wideout or flex starter in the fantasy playoffs.

Crabtree hasn't posted huge fantasy numbers in his first two games back from a serious Achilles' ailment, but he's looking no worse for wear and could still make a nice statistical impact in the next few weeks. In fact, a Week 16 matchup (fantasy championship week) against the Atlanta Falcons could make Crabtree as much as a No. 3 fantasy wideout or flex starter for owners, more so for those teams in PPR formats.

Tannehill has been on fire in recent weeks, scoring no fewer than 18 fantasy points in his last three starts. That includes a solid stat line against the Pittsburgh Steelers, as he threw for two touchdowns and even rushed for an additional 56 yards. Next on the schedule is an important AFC East game against the New England Patriots, who haven't been playing very well on the defensive side of the football in recent weeks.

Patterson had a major breakout game in the stat sheets in Week 14, posting five catches for 141 yards with one touchdown and an impressive 20.7 points in standard scoring leagues. The Vikings should continue to target their rookie, as the team is out of postseason contention and will look to get him more work in the remaining weeks of the season. He has a good matchup against the Philadelphia Eagles coming next.

Walker was inactive last week due to a concussion, but he's still someone to consider if he's back on the field for Week 15. That's due in large part to a game against the Arizona Cardinals, who have allowed more receiving yards, more touchdowns and more fantasy points to tight ends than any other team in the league. Again, keep tabs on his status, but an active Walker is a solid matchup-based option at the position.