The Oakland Raiders' difficult Sunday just got a whole lot worse.

Quarterback Derek Carr exited the game with a little more than two minutes remaining in the third quarter. Former Bills first-round pick E.J. Manuel is the team's No. 2 quarterback.

The Raiders announced that Carr's injury was to his back, and he's questionable to return.

Carr, who was 10-of-18 for 143 yards and a touchdown, looked to be shaken up after bouncing off multiple Bronco defenders en route to the ground. The sack sent Carr to the sideline medical tent and eventually the locker room.

The tight ends have been the stars of training camp, with Derek Carr often throwing to his new 6-foot-5, 254-pound target, Jared Cook; Lee Smith, Clive Walford and Gabe Holmes have looked very good as well.

“We haven’t really gotten our tight-end position going as much as I’d like,” Del Rio said. “I think we’ve really addressed that. I think you’re going to see a team that can utilize the tight-end position more in their offensive plan and attack.

“Jared Cook opens up a lot of possibilities and Clive being in much better shape and healthier than he’s been, probably in a while, helps.”

Carr has been ecstatic about his new toy.

“When you add a guy like Jared Cook that runs a 4.3 or a 4.4 and he can outrun DBs on go-routes, (you) can throw him out wide and run different kinds of routes with him,” Carr said. “We can do that kind of stuff because he is that talented.”

Once Cook returned from his high-ankle sprain in Week 10, the Packers made a concerted effort to involve him in the offense. Over the final 10 games (including the playoffs) he averaged 4.2 catches for 55 yards and 0.30 touchdowns per game. That equates to 11.5 PPG, or low-end TE1 numbers. He joins the Raiders, who have not featured the tight end in the passing game in recent years. Oakland tight ends saw a total of 83 targets in 2016, which was the 4th-fewest in the league. The Cook acquisition may be the team’s attempt to change this.

The Raiders and QB Derek Carr have finalized a 5-year monster extension worth $125M, sources say. Highest paid player in history.

It looks like the Raiders have their quarterback. From a fantasy standpoint, it doesn't change much, though TJ Hernandez identified Carr as a positive regression candidate in his Red Zone Expected Value Series.

The Raiders are going to sign FA TE Jared Cook. A huge addition for QB Derek Carr and their offense.

Once Cook returned from his high-ankle sprain in Week 10, the Packers made a concerted effort to involve him in the offense. Over the final 10 games (including the playoffs) he averaged 4.2 catches for 55 yards and 0.30 touchdowns per game. That equates to 11.5 PPG, or low-end TE1 numbers. It's a nice signing for the Raiders, who seemingly want to involve the position more in their passing attack. Derek Carr gets a bump and Cook is in the mix as a late-round tight end.

Injured Raiders quarterback Derek Carr said in a radio interview Tuesday with 95.7 The Game in San Francisco that it “ripped [his] heart out” to watch the Raiders play on television last Sunday at Denver.

Carr suffered a broken leg on Christmas Eve and had surgery a few days later. That surgery revealed no ligament damage, which bodes well for Carr being back on the field this spring.

The playoff-bound Oakland Raiders are down to their third quarterback.

Rookie Connor Cook replaced Matt McGloin late in the second half of Sunday’s game against the Denver Broncos after McGloin suffered a shoulder injury.

McGloin made his first start since 2013 on Sunday after starter Derek Carr suffered a broken fibula last week.

The Raiders were trailing 17-0 when Cook entered the game. McGloin was 6-for-11 with just 21 passing yards when he was injured. The team announced he was questionable to return in the second half. The Raiders would clinch the AFC West title and No. 2 seed with a win. With a loss and a Kansas City Chiefs win in San Diego, Oakland would instead be a wild-card team and play next week at Houston.