If you're still alive in fantasy football this week, you've likely got a lot to play for.

With so much riding on one game, and your season possibly ending with a single mistake or flop in your lineup, every personnel decision you make carries a ton of weight. That makes it especially concerning if you notice a hole in your lineup -- either from an injury, disappointing play or a tough matchup -- staring at you.

If you're looking to plug in a player to start this week, you're either looking for a guy with a high floor, who you can at least count on not to sink your lineup, or a high-upside guy, who can post a week comparable to what you see out of fantasy studs, with the ability to lift your underdog team to an upset championship berth.

Whatever your situation is this week, here are seven guys flying under the radar that are worth taking a look at in Week 15.