
Sometimes in fantasy football, owners have to get desperate. Whether it's because of an abundance of injuries, having too many players on a bye week, facing difficult matchups or simply being in a deep league, there will often be times when you have to scrape the bottom of the waiver wire to find someone to start. Fortunately there are only two bye weeks (Green Bay Packers and Philadelphia Eagles) in Week 4, but if you've been hit hard by injuries or are in a league with 14 or more teams, we've got some extremely deep sleepers (going by Yahoo ownership percentage, we're looking at quarterbacks who are 33 percent or less owned, running backs and wide receivers who are 10 percent or less owned, and tight ends who are 20 percent or less owned) to help fill out your lineup. You can click through the gallery for a closer look at some options for every position, or you can click here if you're looking for some sleepers in more standard leagues. (Getty)

QB: Joe Flacco, Baltimore Ravens
Ownership Percentage (Yahoo): 32
Opponent: vs. Oakland Raiders
Flacco hasn't been great to start the season (5.5 adjusted yards per attempt and a 3-to-4 TD/INT ratio), but this is the perfect spot for him to improve those numbers. Not only is he at home, where, since 2015 when pass-happy offensive coordinator Marc Trestman took over, he has averaged over seven fantasy points more per game than on the road, but he's also up against a Raiders defense that has been gashed for the fourth-most fantasy points per game this year. (Getty)

RB: Travaris Cadet, New Orleans Saints
Ownership Percentage (Yahoo): 2
Opponent: at San Diego Chargers
Because the Saints' defense is abysmal and they're often forced to throw the ball to keep up (highest passing play percentage in the NFL through three weeks), Cadet's role as a pass-catching back can be valuable. He has tallied 16 targets (three inside the 10-yard line), 11 receptions, 63 receiving yards and a touchdown through three games, and he played a healthy 40.7 percent of the offensive snaps last week. With the Saints four-point underdogs in a potential shootout, Cadet should again play big role in Week 4, and he'll do so against a Chargers defense that has allowed the most targets (11.0 per game), second-most receptions (9.0) and fourth-most receiving yards (71.7) to opposing running backs. This is more of a PPR play, but it's one with sneaky good potential. (Getty)

WR: Terrance Williams, Dallas Cowboys
Ownership Percentage (Yahoo): 8
Opponent: at San Francisco 49ers
If Dez Bryant (hairline fracture in his knee, questionable) sits out as expected, Brice Butler will be the popular deep sleeper play, but Williams--for as frustrating as he is--is higher on the depth chart. He turned four targets into four catches for 88 yards last week, and in seven games with Bryant sidelined, Williams has averaged 7.29 targets, 3.57 receptions and 66.86 yards with a pair of touchdowns. (Getty)

WR: Adam Humphries, Tampa Bay Buccaneers
Ownership Percentage (Yahoo): 6
Opponent: Denver Broncos
As Vincent Jackson continues to do little of anything opposite Mike Evans, Humphries has carved out a significant volume role in this offense. Since Week 1, he has progressed from five targets to eight to 12, catching three passes (34 yards), then six (67 yards), then nine (100 yards). The matchup is brutal, as Humphries is likely to see a lot of elite corner Chris Harris, but pure volume alone gives him some decent potential. If you need a WR in a PPR league, I'd look at Humphries. If you're in a standard league, I'd go with Terrance Williams. (Getty)

TE: Jack Doyle, Indianapolis Colts
Ownership Percentage (Yahoo):17
Opponent: at Jacksonville Jaguars (Wembley Stadium in London)
Dwayne Allen may be above Doyle on the Indy tight end depth chart, but through three weeks, they're tied in targets (15), while Doyle is out-pacing him in red-zone targets (three), receptions (13), yards (137) and touchdowns (two). This is an offense that utilizes two tight ends, and Doyle has become more than just a player with touchdown upside, although that is still his No. 1 trait. There are a lot of tight end sleepers this week (Zach Miller, Hunter Henry, Cameron Brate), but he's one of the more under-the-radar ones. (Getty)

Start ‘Em Sit ‘Em Week 4: Deep-League Sleepers to Play