It's getting increasingly difficult to keep fantasy football rosters fully populated.

Between the unfortunately ever-present injury bug and the NFL's hellacious bye week schedule—four teams off last week, four off this week, six off next week—there is a better than decent chance you'll find yourself in need of roster reinforcements.

Luckily, help is on the way. Or rather, it can be on the way provided you pounce on these waiver wire targets. And if you don't have roster space available but still want to change things up, we'll highlight a couple of players you can cut loose.

Add: Bo Nix, QB, Denver Broncos

Bo Nix isn't merely having a good fantasy season for a rookie quarterback. He's having a strong campaign for a quarterback in general.

With his passing production perking up and his rushing value raising his floor, he has managed to post the ninth-most fantasy points at the position, per FantasyPros. And he might keep climbing the rankings if he keeps playing like he has, throwing multiple touchdown passes in four of his last six outings.

Throw in some favorable upcoming matchups (Atlanta this week, Las Vegas the next), and Nix should be a priority target for anyone in the quarterback market.

Drop: Caleb Williams, QB, Chicago Bears

The nightmare continues for No. 1 pick Caleb Williams. In fact, things are only getting scarier as his first season progresses.

His production is plummeting (zero touchdowns in three consecutive games), and the offense's stagnation just cost former coordinator Shane Waldron his job. There are even rumblings about Bears veterans requesting a change at quarterback.

If you've been holding your breath for a Williams resurgence, it's beyond time to exhale and move on. The fact he's still rostered in over 60 percent of Yahoo leagues feels criminal.

Add: Ricky Pearsall, WR, San Francisco 49ers

While the 49ers couldn't solve their issues in the red zone (or with special teams) Sunday, their offense otherwise perked up during Christian McCaffrey's debut. And while there's always a worry this team's plethora of playmakers will eat into the others' production, it sure feels like rookie receiver Ricky Pearsall is on the verge of delivering consistent numbers.

He has seen 15 targets over his first three career contests, and he keeps doing more with his opportunities. Everything fell into place Sunday when he turned six targets into four receptions for 73 yards and his first career touchdown. And this came after his last appearance yielded four receptions for 38 yards and a 39-yard run.

San Francisco is getting healthier, but it needs someone to fill the void of Brandon Aiyuk, who was lost for the season to a knee injury. Pearsall, who coincidentally played with Aiyuk at Arizona State, seems up to that tall task.

Drop: Devin Singletary, RB, New York Giants

At the start of this season, it seemed like Devin Singletary might see featured-back usage in New York. Then, a groin injury kept him out a few games, rookie Tyrone Tracy Jr. shined in his absence and the situation had everyone making some kind of Wally Pipp reference.

Singletary's season has never recovered. While he's been efficient of late (4.9 yards per carry over his last three contests), Tracy's spot atop the depth chart has remained unchallenged. During this same stretch, the touch tally sits in Tracy's favor by a 58-20 count.

Tack on the fact the Giants are on a bye this week, and there's no reason to roster Singletary outside of deep leagues with limited waiver-wire options.