Welcome to prime time.

After an 8-1 start to the season, the 49ers have been flexed into two marquee games under the lights at Levi's Stadium: Week 12 against the Green Bay Packers and Week 16 against the Los Angeles Rams.

⭐️ PRIMETIME BABY ⭐️#GBvsSF has been 💪 to 5:20pm PT #LARvsSF has been scheduled for Dec. 21 at 5:15pm PT

— San Francisco 49ers (@49ers) November 12, 2019

The 49ers-Packers game, originally scheduled for 1:25 p.m. on Nov. 24, has been moved to a 5:20 p.m. kickoff for "Sunday Night Football" on NBC. Iconic broadcasters Al Michaels and Cris Collinsworth will call the game from Santa Clara, as the NFC-leading 49ers take on Aaron Rodgers and the 8-2 Packers.

Meanwhile, the 49ers-Rams NFC West clash, originally scheduled as "TBD" for Saturday Dec. 21 or Sunday Dec. 22, officially will kick off at 5:20 p.m. on Saturday the 21st. The 49ers beat the Rams 20-7 in Los Angeles in Week 6, so Jared Goff and the underachieving Rams will try to get revenge under the lights at Levi's. The game will be broadcast on NFL Network.

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Get your popcorn ready, 49ers fans. Prime-time football is here.

The 49ers' receiving corps will be thin Sunday against the New Orleans Saints. 

Marquise Goodwin (knee, foot) and Dante Pettis (knee) were among San Francisco's inactive players heading into Sunday's game in New Orleans, leaving the 49ers with just four active wide receivers for Week 14. 

#49ers inactives vs. #Saints:

QB C.J. Beathard
RB Jeff Wilson
WR Marquise Goodwin
WR Dante Pettis
TE Levine Toilolo
S Jaquiski Tartt
DL Jullian Taylor

— Matt Maiocco (@MaioccoNBCS) December 8, 2019

Goodwin and Pettis were listed as questionable heading into Sunday after practicing on a limited basis Friday. None of the other inactives were much of a surprise, given the 49ers' log jam at running back and known injuries to safety Jacquiski Tartt and defensive tackle Jullian Taylor. 

[RELATED: 49ers' pass rush returns to 'fun' style of play vs. Saints]

Left tackle Joe Staley will be active for the first time since Week 9 after undergoing surgery to repair a fractured and dislocated finger. It will only be Staley's fourth game this season, as he also missed much of the season with a broken fibula. The 49ers' active-roster decisions, then, should provide Staley some cover. 

This means the #49ers will have an extra offensive lineman up to rotate in if necessary. Joe Staley is coming back from injury and the want to be careful with him. https://t.co/agpXjW7pWY

— Jennifer Lee Chan (@jenniferleechan) December 8, 2019

The 49ers will hope he doesn't need it against Cam Jordan and the Saints' formidable defense. 

NEW ORLEANS – The 49ers’ pass rush can once again be a factor this week.

The 49ers went into their Week 13 game against the Baltimore Ravens knowing they had to make some dramatic changes with their style of getting after the quarterback.

After all, they could not be so aggressive, as 49ers defensive line coach Kris Kocurek teaches, because of the running ability of Ravens quarterback Lamar Jackson.

On Sunday, they can get back to normal against the passing attack of the New Orleans Saints with quarterback Drew Brees.

“Those guys want to get after the quarterback,” 49ers coach Kyle Shanahan said on the 49ers Insider Podcast. “I know the D-line. I know their coach. It was a tough week for them. But they rose to the challenge and played those techniques very well. I thought they did a very good job against Baltimore and stopping the run.

“And now this week, you still got to stop the run. It always starts with that, but you can play a little more of those techniques you’re used to, which I know they have a lot more fun playing and I know we have a lot more fun coaching it, too.”

It certainly will not be easy for the 49ers’ pass rush to get to Brees, who has been sacked just nine times on 249 drop-backs this season. Brees gets the ball out quickly, in order to neutralize the 49ers’ pass rush of Arik Armstead, Nick Bosa, DeForest Buckner and Dee Ford.

A week ago, the 49ers played a different style in an attempt to prevent big plays from Baltimore’s quarterback-driven run game. Buckner registered the team’s only sack, and that came for zero yards.

The 49ers gave up some rushing yards, but made adjustments in the second half to limit Baltimore to just three points in the final 30 minutes.

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“When you do that, you definitely have to change-up your fronts and play run-first at all times,” Shanahan said. “You got to almost play in a four-point stance and just control people instead of teeing off on guys and trying to go through them. I know last week was a frustrating week.”

The 49ers own the league's top-ranked passing defense, allowing just 134.2 yards passing per game. The 49ers rank second in the NFL with 45 sacks.